261 relations: Abiogenesis, Actin, Actinomycetales, Adenosine triphosphate, Algae, Allium, Amino acid, Amoeba (genus), Amphiphile, Anabolism, Animal, Antenna (biology), Antigen, Antimicrobial resistance, Antonie van Leeuwenhoek, Archaea, Bacillus anthracis, Bacteria, Bacterial capsule, Bacterial conjugation, Benjamin Cummings, Biological membrane, Biological process, Biology, Biomolecule, Blood cell, Borrelia, Borrelia burgdorferi, Brown algae, Caenorhabditis elegans, Catabolism, Cell adhesion, Cell biology, Cell cortex, Cell culture, Cell cycle, Cell division, Cell envelope, Cell membrane, Cell nucleus, Cell potency, Cell signaling, Cell theory, Cell type, Cell wall, Cellular compartment, Cellular component, Cellular differentiation, Cellular model, Cellular respiration, ..., Cellularization, Centriole, Centrosome, Chemotaxis, Chloroplast, Christian monasticism, Chromosome, Cilium, Colony (biology), Cork (material), Cyanobacteria, Cytokinesis, Cytolysis, Cytoneme, Cytoplasm, Cytorrhysis, Cytoskeleton, Cytosol, Cytotoxicity, Deltaproteobacteria, Desmin, Digestive enzyme, DNA, DNA replication, Domain (biology), Early Earth, Edmund Beecher Wilson, Embryo, Endocytosis, Endomembrane system, Endoplasmic reticulum, Enzyme, EPUB, Ernst Ruska, Eukaryote, Eukaryotic large ribosomal subunit (60S), Eukaryotic small ribosomal subunit (40S), Evolutionary pressure, Experimental evolution, Extrachromosomal DNA, Fibroblast, Filopodia, Fimbria (bacteriology), Fission (biology), Flagellin, Flagellum, Flowering plant, Francesco Redi, Francevillian biota, Francis Crick, Fungus, Gabon, Gamete, Gene, Gene expression, Genetic code, Genetics, Genome, Genotype, Glucose, Golgi apparatus, Grypania, Hemoglobin, Heterotroph, Histone, Homo sapiens, Homologous chromosome, Hormone, Howard Hughes Medical Institute, Humboldt University of Berlin, Hyaluronic acid, Hydrogen hypothesis, Hydrogenosome, Hydrolase, Hydrophile, Hydrophobe, Hydrothermal vent, Intermediate filament, Ion, James Watson, Keratin, Lamellipodium, Lamin, Latin, Lens (optics), Life, Lipid, Lipid bilayer, Lipid raft, Louis Pasteur, Lynn Margulis, Lysosome, Macromolecule, Matthias Jakob Schleiden, Mechanosensation, Meiosis, Membrane, Membrane potential, Messenger RNA, Metastasis, Methanosarcina, Methyl blue, Microfilament, Micrographia, Micrometre, Microscope, Microtubule, Miller–Urey experiment, Mitochondrial DNA, Mitochondrion, Mitosis, Molecule, Monastery, Monosaccharide, Multicellular organism, Murchison meteorite, Mycetozoa, Mycoplasma, Myocyte, Myxobacteria, National Center for Biotechnology Information, National Institutes of Health, Nature (journal), Neisseria meningitidis, Neuron, Nuclear envelope, Nucleic acid, Nucleic acid double helix, Nucleoid, Nucleolus, Onion, Ontogeny, Optical microscope, Orders of magnitude (numbers), Organ (anatomy), Organelle, Organism, Osmotic pressure, Outline of cell biology, Oxidative phosphorylation, Oxygen, Paleoproterozoic, Peptide, Peptide nucleic acid, Peptidoglycan, Peroxide, Peroxisome, Photosynthesis, Pilin, Pilus, Pinophyta, Plant, Plant cell, Plasmid, Plasmolysis, Ploidy, Polysaccharide, Prokaryote, Prokaryotic large ribosomal subunit, Prokaryotic small ribosomal subunit, Protein, Proteobacteria, Protist, Protozoa, Queen Mary University of London, Red algae, Red blood cell, Reducing agent, Regulation of gene expression, Ribosome, RNA, RNA world, Robert Hooke, Rosalind Franklin, Rudolf Virchow, Semipermeable membrane, Sex chromosome, Skin, Slime mold, Spindle apparatus, Spirochaete, Stem cell, Streptococcus, Streptococcus pneumoniae, Symbiogenesis, Symbiosis, Syncytium, Theodor Schwann, Thermoplasma, Three-domain system, Timeline of the evolutionary history of life, Tissue (biology), Tonicity, Transcription (biology), Transfection, Transfer RNA, Translation (biology), Transmission electron microscopy, Tubulin, Tunneling nanotube, Unicellular organism, University of Arizona, Vacuole, Vault (organelle), Vegetative reproduction, Vesicle (biology and chemistry), Vimentin, Viridiplantae, Virus, Vorticella, Zygote. Expand index (211 more) » « Shrink index
Abiogenesis, or informally the origin of life,Compare: Also occasionally called biopoiesis.
Actin is a family of globular multi-functional proteins that form microfilaments.
The Actinomycetales are an order of Actinobacteria.
Adenosine triphosphate (ATP) is a complex organic chemical that participates in many processes.
Algae (singular alga) is an informal term for a large, diverse group of photosynthetic organisms that are not necessarily closely related, and is thus polyphyletic.
Allium is a genus of monocotyledonous flowering plants that includes hundreds of species, including the cultivated onion, garlic, scallion, shallot, leek, and chives.
Amino acids are organic compounds containing amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain (R group) specific to each amino acid.
Amoeba is a genus of single-celled amoeboids in the family Amoebidae.
An amphiphile (from the Greek αμφις, amphis: both and φιλíα, philia: love, friendship) is a chemical compound possessing both hydrophilic (water-loving, polar) and lipophilic (fat-loving) properties.
Anabolism (from ἁνά, "upward" and βάλλειν, "to throw") is the set of metabolic pathways that construct molecules from smaller units.
Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia.
Antennae (singular: antenna), sometimes referred to as "feelers," are paired appendages used for sensing in arthropods.
In immunology, an antigen is a molecule capable of inducing an immune response (to produce an antibody) in the host organism.
Antimicrobial resistance (AMR or AR) is the ability of a microbe to resist the effects of medication that once could successfully treat the microbe.
Antonie Philips van Leeuwenhoek FRS (24 October 1632 – 26 August 1723) was a Dutch businessman and scientist in the Golden Age of Dutch science and technology.
Archaea (or or) constitute a domain of single-celled microorganisms.
Bacillus anthracis is the etiologic agent of anthrax—a common disease of livestock and, occasionally, of humans—and the only obligate pathogen within the genus Bacillus.
Bacteria (common noun bacteria, singular bacterium) is a type of biological cell.
Some bacterial cells are surrounded by a viscous substance forming a covering layer or envelope around the cell wall.
Bacterial conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or by a bridge-like connection between two cells.
Benjamin Cummings specializes in science and is a publishing imprint of Pearson Education, the world's largest education publishing and technology company, which is part of Pearson PLC, the global publisher and former owner of Penguin Books and the Financial Times.
A biological membrane or biomembrane is an enclosing or separating membrane that acts as a selectively permeable barrier within living things.
Biological processes are the processes vital for a living organism to live.
Biology is the natural science that studies life and living organisms, including their physical structure, chemical composition, function, development and evolution.
A biomolecule or biological molecule is a loosely used term for molecules and ions that are present in organisms, essential to some typically biological process such as cell division, morphogenesis, or development.
A blood cell, also called a haematopoietic cell, hemocyte, or hematocyte, is a cell produced through hematopoiesis and found mainly in the blood.
Borrelia is a genus of bacteria of the spirochete phylum.
Borrelia burgdorferi is a bacterial species of the spirochete class of the genus Borrelia.
The brown algae (singular: alga), comprising the class Phaeophyceae, are a large group of multicellular algae, including many seaweeds located in colder waters within the Northern Hemisphere.
Caenorhabditis elegans is a free-living (not parasitic), transparent nematode (roundworm), about 1 mm in length, that lives in temperate soil environments.
Catabolism (from Greek κάτω kato, "downward" and βάλλειν ballein, "to throw") is the set of metabolic pathways that breaks down molecules into smaller units that are either oxidized to release energy or used in other anabolic reactions.
Cell adhesion is the process by which cells interact and attach to neighbouring cells through specialised molecules of the cell surface.
Cell biology (also called cytology, from the Greek κυτος, kytos, "vessel") is a branch of biology that studies the structure and function of the cell, the basic unit of life.
The cell cortex, also known as the actin cortex or actomyosin cortex, is a specialized layer of cytoplasmic protein on the inner face of the plasma membrane of the cell periphery.
Cell culture is the process by which cells are grown under controlled conditions, generally outside their natural environment.
The cell cycle or cell-division cycle is the series of events that take place in a cell leading to its division and duplication of its DNA (DNA replication) to produce two daughter cells.
Cell division is the process by which a parent cell divides into two or more daughter cells.
The cell envelope comprises the inner cell membrane and the cell wall of a bacterium, if present, plus a bacterial outer membrane (i.e. in gram-negative bacteria).
The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space).
In cell biology, the nucleus (pl. nuclei; from Latin nucleus or nuculeus, meaning kernel or seed) is a membrane-enclosed organelle found in eukaryotic cells.
Cell potency is a cell's ability to differentiate into other cell types The more cell types a cell can differentiate into, the greater its potency.
Cell signaling (cell signalling in British English) is part of any communication process that governs basic activities of cells and coordinates all cell actions.
In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
A cell type is a classification used to distinguish between morphologically or phenotypically distinct cell forms within a species.
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane.
Cellular compartments in cell biology comprise all of the closed parts within the cytosol of a eukaryotic cell, usually surrounded by a single or double lipid layer membrane.
Cellular components are the complex biomolecules and structures of which cells, and thus living organisms, are composed.
In developmental biology, cellular differentiation is the process where a cell changes from one cell type to another.
Creating a cellular model has been a particularly challenging task of systems biology and mathematical biology.
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
The theory of cellularization, also known as Ciliate-acoel theory, is one of the theories explaining the origin of the metazoans.
In cell biology a centriole is a cylindrical cellular organelle composed mainly of a protein called tubulin.
In cell biology, the centrosome (Latin centrum 'center' + Greek sōma 'body') is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell as well as a regulator of cell-cycle progression.
Chemotaxis (from chemo- + taxis) is the movement of an organism in response to a chemical stimulus.
Chloroplasts are organelles, specialized compartments, in plant and algal cells.
Christian monasticism is the devotional practice of individuals who live ascetic and typically cloistered lives that are dedicated to Christian worship.
A chromosome (from Ancient Greek: χρωμόσωμα, chromosoma, chroma means colour, soma means body) is a DNA molecule with part or all of the genetic material (genome) of an organism.
A cilium (the plural is cilia) is an organelle found in eukaryotic cells.
In biology, a colony is composed of two or more conspecific individuals living in close association with, or connected to, one another.
Cork is an impermeable buoyant material, the phellem layer of bark tissue that is harvested for commercial use primarily from Quercus suber (the cork oak), which is endemic to southwest Europe and northwest Africa.
Cyanobacteria, also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis, and are the only photosynthetic prokaryotes able to produce oxygen.
Cytokinesis is the part of the cell division process during which the cytoplasm of a single eukaryotic cell divides into two daughter cells.
Cytolysis, or osmotic lysis, occurs when a cell bursts due to an osmotic imbalance that has caused excess water to diffuse into the cell.
Cytonemes are thin, cellular projections that are specialized for exchange of signaling proteins between cells.
In cell biology, the cytoplasm is the material within a living cell, excluding the cell nucleus.
Cytorrhysis is the permanent and irreparable damage to the cell wall after the complete collapse of a plant cell due to the loss of internal positive pressure (hydraulic turgor pressure).
A cytoskeleton is present in all cells of all domains of life (archaea, bacteria, eukaryotes).
The cytosol, also known as intracellular fluid (ICF) or cytoplasmic matrix, is the liquid found inside cells.
Cytotoxicity is the quality of being toxic to cells.
The Deltaproteobacteria are a class of Proteobacteria.
Desmin is a protein that in humans is encoded by the DES gene.
Digestive enzymes are a group of enzymes that break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption by the body.
Deoxyribonucleic acid (DNA) is a thread-like chain of nucleotides carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.
In biological taxonomy, a domain (Latin: regio), also superkingdom or empire, is the highest taxonomic rank of organisms in the three-domain system of taxonomy designed by Carl Woese, an American microbiologist and biophysicist.
The early Earth (sometimes referred to as Gaia) is loosely defined as Earth in its first one billion years, or gigayear.
Edmund Beecher Wilson (19 October 1856 – 3 March 1939) was a pioneering American zoologist and geneticist.
An embryo is an early stage of development of a multicellular diploid eukaryotic organism.
Endocytosis is a form of bulk transport in which a cell transports molecules (such as proteins) into the cell (endo- + cytosis) by engulfing them in an energy-using process.
The endomembrane system is composed of the different membranes that are suspended in the cytoplasm within a eukaryotic cell.
The endoplasmic reticulum (ER) is a type of organelle found in eukaryotic cells that forms an interconnected network of flattened, membrane-enclosed sacs or tube-like structures known as cisternae.
Enzymes are macromolecular biological catalysts.
EPUB is an e-book file format with the extension.epub EPUB files can be read using complying software on devices like smartphones, tablets, computers, or e-readers.
Ernst August Friedrich Ruska (25 December 1906 – 27 May 1988) was a German physicist who won the Nobel Prize in Physics in 1986 for his work in electron optics, including the design of the first electron microscope.
Eukaryotes are organisms whose cells have a nucleus enclosed within membranes, unlike Prokaryotes (Bacteria and other Archaea).
Ribosomal particles are denoted according to their sedimentation coefficients in Svedberg units.
The eukaryotic small ribosomal subunit (40S) is the smaller subunit of the eukaryotic 80S ribosomes, with the other major component being the large ribosomal subunit (60S).
Any cause that reduces reproductive success in a portion of a population potentially exerts evolutionary pressure, selective pressure or selection pressure.
Experimental evolution is the use of laboratory experiments or controlled field manipulations to explore evolutionary dynamics.
Extrachromosomal DNA is any DNA that is found outside the nucleus of a cell.
A fibroblast is a type of biological cell that synthesizes the extracellular matrix and collagen, the structural framework (stroma) for animal tissues, and plays a critical role in wound healing.
Filopodia (also microspikes) are slender cytoplasmic projections that extend beyond the leading edge of lamellipodia in migrating cells.
In bacteriology, a fimbria (plural fimbriae), also referred to as an "attachment pilus" by some scientists, is an appendage that can be found on many Gram-negative and some Gram-positive bacteria that is thinner and shorter than a flagellum.
Fission, in biology, is the division of a single entity into two or more parts and the regeneration of those parts into separate entities resembling the original.
Flagellin is a globular protein that arranges itself in a hollow cylinder to form the filament in a bacterial flagellum.
A flagellum (plural: flagella) is a lash-like appendage that protrudes from the cell body of certain bacterial and eukaryotic cells.
The flowering plants, also known as angiosperms, Angiospermae or Magnoliophyta, are the most diverse group of land plants, with 416 families, approximately 13,164 known genera and c. 295,383 known species.
Francesco Redi (18 February 1626 – 1 March 1697) was an Italian physician, naturalist, biologist and poet.
The Francevillian biota (also known as Gabon macrofossils or Gabonionta) is a group of 2.1-billion-year-old Palaeoproterozoic, macroscopic organisms known from fossils found in Gabon in the Palaeoproterozoic Francevillian B Formation, a black shale province.
Francis Harry Compton Crick (8 June 1916 – 28 July 2004) was a British molecular biologist, biophysicist, and neuroscientist, most noted for being a co-discoverer of the structure of the DNA molecule in 1953 with James Watson, work which was based partly on fundamental studies done by Rosalind Franklin, Raymond Gosling and Maurice Wilkins.
A fungus (plural: fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms.
Gabon, officially the Gabonese Republic (République gabonaise), is a sovereign state on the west coast of Central Africa.
A gamete (from Ancient Greek γαμετή gamete from gamein "to marry") is a haploid cell that fuses with another haploid cell during fertilization (conception) in organisms that sexually reproduce.
In biology, a gene is a sequence of DNA or RNA that codes for a molecule that has a function.
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product.
The genetic code is the set of rules used by living cells to translate information encoded within genetic material (DNA or mRNA sequences) into proteins.
Genetics is the study of genes, genetic variation, and heredity in living organisms.
In the fields of molecular biology and genetics, a genome is the genetic material of an organism.
The genotype is the part of the genetic makeup of a cell, and therefore of an organism or individual, which determines one of its characteristics (phenotype).
Glucose is a simple sugar with the molecular formula C6H12O6.
The Golgi apparatus, also known as the Golgi complex, Golgi body, or simply the Golgi, is an organelle found in most eukaryotic cells.
Grypania is an early, tube-shaped fossil from the Proterozoic eon.
Hemoglobin (American) or haemoglobin (British); abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates (with the exception of the fish family Channichthyidae) as well as the tissues of some invertebrates.
A heterotroph (Ancient Greek ἕτερος héteros.
In biology, histones are highly alkaline proteins found in eukaryotic cell nuclei that package and order the DNA into structural units called nucleosomes.
Homo sapiens is the systematic name used in taxonomy (also known as binomial nomenclature) for the only extant human species.
A couple of homologous chromosomes, or homologs, are a set of one maternal and one paternal chromosome that pair up with each other inside a cell during meiosis.
A hormone (from the Greek participle “ὁρμῶ”, "to set in motion, urge on") is any member of a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behaviour.
The Howard Hughes Medical Institute (HHMI) is an American non-profit medical research organization based in Chevy Chase, Maryland.
The Humboldt University of Berlin (Humboldt-Universität zu Berlin, abbreviated HU Berlin), is a university in the central borough of Mitte in Berlin, Germany.
Hyaluronic acid (HA; conjugate base hyaluronate), also called hyaluronan, is an anionic, nonsulfated glycosaminoglycan distributed widely throughout connective, epithelial, and neural tissues.
The hydrogen hypothesis is a model proposed by William F. Martin and Miklós Müller in 1998 that describes a possible way in which the mitochondrion arose as an endosymbiont within an archaeon (without doubts classified as prokaryote at then times), giving rise to a symbiotic association of two cells from which the first eukaryotic cell could have arisen (symbiogenesis).
A hydrogenosome is a membrane-enclosed organelle of some anaerobic ciliates, trichomonads, fungi, and animals.
Hydrolase is a class of enzyme that is commonly used as biochemical catalysts that utilize water to break a chemical bond.
A hydrophile is a molecule or other molecular entity that is attracted to water molecules and tends to be dissolved by water.
In chemistry, hydrophobicity is the physical property of a molecule (known as a hydrophobe) that is seemingly repelled from a mass of water.
A hydrothermal vent is a fissure in a planet's surface from which geothermally heated water issues.
Intermediate filaments (IFs) are cytoskeletal components found in the cells of vertebrate animal species, and perhaps also in other animals, fungi, plants, and unicellular organisms.
An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).
James Dewey Watson (born April 6, 1928) is an American molecular biologist, geneticist and zoologist, best known as one of the co-discoverers of the structure of DNA in 1953 with Francis Crick and Rosalind Franklin.
Keratin is one of a family of fibrous structural proteins.
The lamellipodium (plural lamellipodia) (from Latin lamina, "thin sheet"; pod, "foot") is a cytoskeletal protein actin projection on the leading edge of the cell.
Nuclear lamins, also known as Class V intermediate filaments, are fibrous proteins providing structural function and transcriptional regulation in the cell nucleus.
Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.
Life is a characteristic that distinguishes physical entities that do have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as inanimate.
In biology and biochemistry, a lipid is a biomolecule that is soluble in nonpolar solvents.
The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules.
The plasma membranes of cells contain combinations of glycosphingolipids and protein receptors organised in glycolipoprotein microdomains termed lipid rafts.
Louis Pasteur (December 27, 1822 – September 28, 1895) was a French biologist, microbiologist and chemist renowned for his discoveries of the principles of vaccination, microbial fermentation and pasteurization.
Lynn Margulis (born Lynn Petra Alexander; March 5, 1938 – November 22, 2011) was an American evolutionary theorist and biologist, science author, educator, and popularizer, and was the primary modern proponent for the significance of symbiosis in evolution.
A lysosome is a membrane-bound organelle found in nearly all animal cells.
A macromolecule is a very large molecule, such as protein, commonly created by the polymerization of smaller subunits (monomers).
Matthias Jakob Schleiden (5 April 1804 23 June 1881) was a German botanist and co-founder of cell theory, along with Theodor Schwann and Rudolf Virchow.
Mechanosensation is a response mechanism to mechanical stimuli.
Meiosis (from Greek μείωσις, meiosis, which means lessening) is a specialized type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them.
A membrane is a selective barrier; it allows some things to pass through but stops others.
The term "membrane potential" may refer to one of three kinds of membrane potential.
Messenger RNA (mRNA) is a large family of RNA molecules that convey genetic information from DNA to the ribosome, where they specify the amino acid sequence of the protein products of gene expression.
Metastasis is a pathogenic agent's spread from an initial or primary site to a different or secondary site within the host's body; it is typically spoken of as such spread by a cancerous tumor.
Methanosarcina is a genus of euryarchaeote archaea that produce methane.
Methyl blue is a chemical compound with the molecular formula C37H27N3Na2O9S3.
Microfilaments, also called actin filaments, are filaments in the cytoplasm of eukaryotic cells that form part of the cytoskeleton.
Micrographia: or Some Phyſiological Deſcriptions of Minute Bodies Made by Magnifying Glasses.
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling (SI standard prefix "micro-".
A microscope (from the μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small to be seen by the naked eye.
Microtubules are tubular polymers of tubulin that form part of the cytoskeleton that provides the cytoplasm of eukaryotic cells and some bacteria with structure and shape.
The Miller–Urey experiment (or Miller experiment) was a chemical experiment that simulated the conditions thought at the time to be present on the early Earth, and tested the chemical origin of life under those conditions.
Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, adenosine triphosphate (ATP).
The mitochondrion (plural mitochondria) is a double-membrane-bound organelle found in most eukaryotic organisms.
In cell biology, mitosis is a part of the cell cycle when replicated chromosomes are separated into two new nuclei.
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
A monastery is a building or complex of buildings comprising the domestic quarters and workplaces of monastics, monks or nuns, whether living in communities or alone (hermits).
Monosaccharides (from Greek monos: single, sacchar: sugar), also called simple sugars, are the most basic units of carbohydrates.
Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.
The Murchison meteorite is a large meteorite that fell to earth near Murchison, Victoria, in Australia, in 1969.
Mycetozoa is a grouping of slime molds.
Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane.
A myocyte (also known as a muscle cell) is the type of cell found in muscle tissue.
The myxobacteria ("slime bacteria") are a group of bacteria that predominantly live in the soil and feed on insoluble organic substances.
The National Center for Biotechnology Information (NCBI) is part of the United States National Library of Medicine (NLM), a branch of the National Institutes of Health (NIH).
The National Institutes of Health (NIH) is the primary agency of the United States government responsible for biomedical and public health research, founded in the late 1870s.
Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.
Neisseria meningitidis, often referred to as meningococcus, is a Gram-negative bacterium that can cause meningitis and other forms of meningococcal disease such as meningococcemia, a life-threatening sepsis.
A neuron, also known as a neurone (British spelling) and nerve cell, is an electrically excitable cell that receives, processes, and transmits information through electrical and chemical signals.
The nuclear envelope, also known as the nuclear membrane, is made up of two lipid bilayer membranes which surrounds the nucleus, and in eukaryotic cells it encases the genetic material.
Nucleic acids are biopolymers, or small biomolecules, essential to all known forms of life.
In molecular biology, the term double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA.
The nucleoid (meaning nucleus-like) is an irregularly shaped region within the cell of a prokaryote that contains all or most of the genetic material, called genophore.
The nucleolus (plural nucleoli) is the largest structure in the nucleus of eukaryotic cells.
The onion (Allium cepa L., from Latin cepa "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium.
Ontogeny (also ontogenesis or morphogenesis) is the origination and development of an organism, usually from the time of fertilization of the egg to the organism's mature form—although the term can be used to refer to the study of the entirety of an organism's lifespan.
The optical microscope, often referred to as the light microscope, is a type of microscope that uses visible light and a system of lenses to magnify images of small subjects.
This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantity and probabilities.
Organs are collections of tissues with similar functions.
In cell biology, an organelle is a specialized subunit within a cell that has a specific function, in which their function is vital for the cell to live.
In biology, an organism (from Greek: ὀργανισμός, organismos) is any individual entity that exhibits the properties of life.
Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane.
The following outline is provided as an overview of and topical guide to cell biology: Cell biology – A branch of biology that includes study of cells regarding their physiological properties, structure, and function; the organelles they contain; interactions with their environment; and their life cycle, division, and death.
Oxidative phosphorylation (or OXPHOS in short) (UK, US) is the metabolic pathway in which cells use enzymes to oxidize nutrients, thereby releasing energy which is used to produce adenosine triphosphate (ATP).
Oxygen is a chemical element with symbol O and atomic number 8.
Paleoproterozoic Era, spanning the time period from (2.5–1.6 Ga), is the first of the three sub-divisions (eras) of the Proterozoic Eon.
Peptides (from Gr.: πεπτός, peptós "digested"; derived from πέσσειν, péssein "to digest") are short chains of amino acid monomers linked by peptide (amide) bonds.
Peptide nucleic acid (PNA) is an artificially synthesized polymer similar to DNA or RNA.
Peptidoglycan, also known as murein, is a polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria, forming the cell wall.
Peroxide is a compound with the structure R-O-O-R. The O−O group in a peroxide is called the peroxide group or peroxo group.
A peroxisome is a type of organelle known as a microbody, found in virtually all eukaryotic cells.
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities (energy transformation).
Pilin refers to a class of fibrous proteins that are found in pilus structures in bacteria.
A pilus (Latin for 'hair'; plural: pili) is a hair-like appendage found on the surface of many bacteria.
The Pinophyta, also known as Coniferophyta or Coniferae, or commonly as conifers, are a division of vascular land plants containing a single extant class, Pinopsida.
Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae.
Plant cells are eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms.
A plasmid is a small DNA molecule within a cell that is physically separated from a chromosomal DNA and can replicate independently.
Plasmolysis is the process in which cells lose water in a hypertonic solution.
Ploidy is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes.
Polysaccharides are polymeric carbohydrate molecules composed of long chains of monosaccharide units bound together by glycosidic linkages, and on hydrolysis give the constituent monosaccharides or oligosaccharides.
A prokaryote is a unicellular organism that lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle.
50S is the larger subunit of the 70S ribosome of prokaryotes.
The prokaryotic small ribosomal subunit, or 30S subunit, is the smaller subunit of the 70S ribosome found in prokaryotes.
Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.
Proteobacteria is a major phylum of gram-negative bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, Yersinia, Legionellales, and many other notable genera. Others are free-living (non-parasitic), and include many of the bacteria responsible for nitrogen fixation. Carl Woese established this grouping in 1987, calling it informally the "purple bacteria and their relatives". Because of the great diversity of forms found in this group, it was named after Proteus, a Greek god of the sea capable of assuming many different shapes and is not named after the genus Proteus. Some Alphaproteobacteria can grow at very low levels of nutrients and have unusual morphology such as stalks and buds. Others include agriculturally important bacteria capable of inducing nitrogen fixation in symbiosis with plants. The type order is the Caulobacterales, comprising stalk-forming bacteria such as Caulobacter. The Betaproteobacteria are highly metabolically diverse and contain chemolithoautotrophs, photoautotrophs, and generalist heterotrophs. The type order is the Burkholderiales, comprising an enormous range of metabolic diversity, including opportunistic pathogens. The Hydrogenophilalia are obligate thermophiles and include heterotrophs and autotrophs. The type order is the Hydrogenophilales. The Gammaproteobacteria are the largest class in terms of species with validly published names. The type order is the Pseudomonadales, which include the genera Pseudomonas and the nitrogen-fixing Azotobacter. The Acidithiobacillia contain only sulfur, iron and uranium-oxidising autotrophs. The type order is the Acidithiobacillales, which includes economically important organisms used in the mining industry such as Acidithiobacillus spp. The Deltaproteobacteria include bacteria that are predators on other bacteria and are important contributors to the anaerobic side of the sulfur cycle. The type order is the Myxococcales, which includes organisms with self-organising abilities such as Myxococcus spp. The Epsilonproteobacteria are often slender, Gram-negative rods that are helical or curved. The type order is the Campylobacterales, which includes important food pathogens such as Campylobacter spp. The Oligoflexia are filamentous aerobes. The type order is the Oligoflexales, which contains the genus Oligoflexus.
A protist is any eukaryotic organism that has cells with nuclei and is not an animal, plant or fungus.
Protozoa (also protozoan, plural protozoans) is an informal term for single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris.
Queen Mary University of London (QMUL) is a public research university in London, England, and a constituent college of the federal University of London.
The red algae, or Rhodophyta, are one of the oldest groups of eukaryotic algae.
Red blood cells-- also known as RBCs, red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes (from Greek erythros for "red" and kytos for "hollow vessel", with -cyte translated as "cell" in modern usage), are the most common type of blood cell and the vertebrate's principal means of delivering oxygen (O2) to the body tissues—via blood flow through the circulatory system.
A reducing agent (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction.
Regulation of gene expression includes a wide range of mechanisms that are used by cells to increase or decrease the production of specific gene products (protein or RNA), and is informally termed gene regulation.
The ribosome is a complex molecular machine, found within all living cells, that serves as the site of biological protein synthesis (translation).
Ribonucleic acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes.
The RNA world is a hypothetical stage in the evolutionary history of life on Earth, in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins.
Robert Hooke FRS (– 3 March 1703) was an English natural philosopher, architect and polymath.
Rosalind Elsie Franklin (25 July 192016 April 1958) was an English chemist and X-ray crystallographer who made contributions to the understanding of the molecular structures of DNA (deoxyribonucleic acid), RNA (ribonucleic acid), viruses, coal, and graphite.
Rudolf Ludwig Carl Virchow (13 October 1821 – 5 September 1902) was a German physician, anthropologist, pathologist, prehistorian, biologist, writer, editor, and politician, known for his advancement of public health.
A semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
An allosome (also referred to as a sex chromosome, heterotypical chromosome, heterochromosome, or idiochromosome) is a chromosome that differs from an ordinary autosome in form, size, and behavior.
Skin is the soft outer tissue covering vertebrates.
Slime mold or slime mould is an informal name given to several kinds of unrelated eukaryotic organisms that can live freely as single cells, but can aggregate together to form multicellular reproductive structures.
In cell biology, the spindle apparatus (or mitotic spindle) refers to the cytoskeletal structure of eukaryotic cells that forms during cell division to separate sister chromatids between daughter cells.
A spirochaete or spirochete is a member of the phylum Spirochaetes, which contains distinctive diderm (double-membrane) bacteria, most of which have long, helically coiled (corkscrew-shaped or spiraled, hence the name) cells.
Stem cells are biological cells that can differentiate into other types of cells and can divide to produce more of the same type of stem cells.
Streptococcus (term coined by Viennese surgeon Albert Theodor Billroth (1829-1894) from strepto- "twisted" + Modern Latin coccus "spherical bacterium," from Greek kokkos meaning "berry") is a genus of coccus (spherical) Gram-positive bacteria belonging to the phylum Firmicutes and the order Lactobacillales (lactic acid bacteria).
Streptococcus pneumoniae, or pneumococcus, is a Gram-positive, alpha-hemolytic (under aerobic conditions) or beta-hemolytic (under anaerobic conditions), facultative anaerobic member of the genus Streptococcus.
Symbiogenesis, or endosymbiotic theory, is an evolutionary theory of the origin of eukaryotic cells from prokaryotic organisms, first articulated in 1905 and 1910 by the Russian botanist Konstantin Mereschkowski, and advanced and substantiated with microbiological evidence by Lynn Margulis in 1967.
Symbiosis (from Greek συμβίωσις "living together", from σύν "together" and βίωσις "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasitic.
A syncytium or symplasm (plural syncytia; from Greek: σύν (syn).
Theodor Schwann (7 December 1810 – 11 January 1882) was a German physiologist.
In taxonomy, Thermoplasma is a genus of the Thermoplasmataceae.
The three-domain system is a biological classification introduced by Carl Woese et al. in 1977 that divides cellular life forms into archaea, bacteria, and eukaryote domains.
This timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth.
In biology, tissue is a cellular organizational level between cells and a complete organ.
Tonicity is a measure of the effective osmotic pressure gradient, as defined by the water potential of two solutions separated by a semipermeable membrane.
Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (especially mRNA) by the enzyme RNA polymerase.
Transfection is the process of deliberately introducing naked or purified nucleic acids into eukaryotic cells.
A transfer RNA (abbreviated tRNA and formerly referred to as sRNA, for soluble RNA) is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length, that serves as the physical link between the mRNA and the amino acid sequence of proteins.
In molecular biology and genetics, translation is the process in which ribosomes in the cytoplasm or ER synthesize proteins after the process of transcription of DNA to RNA in the cell's nucleus.
Transmission electron microscopy (TEM, also sometimes conventional transmission electron microscopy or CTEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image.
Tubulin in molecular biology can refer either to the tubulin protein superfamily of globular proteins, or one of the member proteins of that superfamily.
A tunnelling nanotube or membrane nanotube is a term that has been applied to protrusions that extend from the plasma membrane that enable different animal cells to touch over long distances, sometimes over 100 μm between T cells.
A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell, unlike a multicellular organism that consists of more than one cell.
The University of Arizona (also referred to as U of A, UA, or Arizona) is a public research university in Tucson, Arizona.
A vacuole is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal and bacterial cells.
The vault or vault cytoplasmic ribonucleoprotein is a eukaryotic organelle whose function is not fully understood.
Vegetative reproduction (also known as vegetative propagation, vegetative multiplication or vegetative cloning) is any form of asexual reproduction occurring in plants in which a new plant grows from a fragment of the parent plant or grows from a specialized reproductive structure.
In cell biology, a vesicle is a small structure within a cell, or extracellular, consisting of fluid enclosed by a lipid bilayer.
Vimentin is a structural protein that in humans is encoded by the VIM gene.
Viridiplantae (literally "green plants") are a clade of eukaryotic organisms made up of the green algae, which are primarily aquatic, and the land plants (embryophytes), which emerged within them.
A virus is a small infectious agent that replicates only inside the living cells of other organisms.
Vorticella is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates.
A zygote (from Greek ζυγωτός zygōtos "joined" or "yoked", from ζυγοῦν zygoun "to join" or "to yoke") is a eukaryotic cell formed by a fertilization event between two gametes.
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