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Class in Biological Definition

Morphogenesis

... to specific protein receptors . An important class of molecules involved in morphogenesis are ... other genes in a regulatory cascade. Another class of molecules involved in morphogenesis are ... studied, and it is representative of one major class of insects. Other multicellular organisms ...

Major histocompatibility complex

... In humans, the MHC is divided into three regions: class I, II, and III. The A, B, and C genes belong to MHC class I while the six D genes belong to class II. Besides being scrutinized by ...

Morphogenesis

... to specific protein receptors . An important class of molecules involved in morphogenesis are ... other genes in a regulatory cascade. Another class of molecules involved in morphogenesis are ... studied, and it is representative of one major class of insects. Other multicellular organisms ...

Paraphyletic

... division of the vertebrates . For example, the class Reptilia as traditionally defined is paraphyletic because that class does not include two groups of its descendants, birds (in class Aves , birds), and mammals ...

Secondary metabolite

... important secondary metabolites of plants : class Alkaloids : Hyoscyamine , present in ... in Erythroxylon coca the Coca plant class Terpenoids : Azadirachtin A, present in ... in Artemisia annua Chinese wormwood class Aliphatic , Aromatic and Heteroaromatic ...

Selective serotonin reuptake inhibitor

... serotonin reuptake inhibitors ( SSRIs ) are a class of antidepressants . They act within the brain ... , which were the most commonly used class of antidepressants before the development of ... List of SSRIs Many drugs in this class are familiar through advertising, including ...

Antibody

... that each contribute two to three constant domains (depending on the class of the antibody). It binds to various cell receptors and complement ... ingests a pathogen , it attaches parts of its proteins to a class II MHC protein. This complex is moved to the outside of the cell ...

Antigen

... fragments. The fragments are then presented on the surface of APCs by class II histocompatibility molecules to T helper cells (CD4 + ). Those that ... The fragments are then presented on the cell surface in the complex with class I histocompatibility molecules . If cytotoxic CD8 + T cells recognize ...

Cytotoxic T cell

... receptors that can bind to fragments of antigens displayed by the class I MHC molecules of virus infected somatic cells and tumor cells. ... the cell surface the protein CD8 , which is attracted to portions of the class I MHC molecule. This affinity keeps the T C cell and the target cell ...

Endosymbiont

... analysis indicates that these symbionts belong to the alpha group of the class Proteobacteria , relating them to Rhizobium and Thiobacillus . Other ... lineage of extracellular marine symbionts in the alpha subdivision of the class Proteobacteria. Burnett, W J and J D McKenzie ...

Endosymbiont

... analysis indicates that these symbionts belong to the alpha group of the class Proteobacteria , relating them to Rhizobium and Thiobacillus . Other ... lineage of extracellular marine symbionts in the alpha subdivision of the class Proteobacteria. Burnett, W J and J D McKenzie ...

Helper T cell

... receptors that can bind to fragments of antigens displayed by the class II MHC molecules found on professional antigen-presenting cells (APCs). ... the cell surface the protein CD4 , which is attracted to portions of the class II MHC molecule. This affinity keeps the T H cell and the target cell ...

Hormone

... as linoleic acid and phospholipids such as arachidonic acid . The main class is the eicosanoids , which includes the widely studied prostaglandins . ... increasing output of thyroid hormones. A recently identified and studied class of hormones is that of the "Hunger Hormones" - ghrelin , orexin and ...

Immune system

... if a pathogen pass through the barrier offered by skin. There are several class of antimicrobial proteins, such as acute phase proteins ( C-reactive ... / lymphocyte macrophage major histocompatibility complex / class I MHC /class II MHC monoclonal antibody / polyclonal antibody ...

Protein

... and keratin are components of skin, hair, and cartilage . Another class are the motor proteins such as myosin , kinesin, and dynein. Muscles ... scientists were finding the first signs of this, at the time, unknown class of organic compounds. See also Biochemistry Crystallography ...

Amine

... the compound is considered an amide rather than an amine. See the Category:Amines for a list of types of amine and some real examples of this class of chemical. As shown in the following pictures, if only one the hydrogens in ammonia is replaced by a carbon based group, then it is a ...

Antibiotic

... An antibiotic is a drug that kills or slows the growth of bacteria . Antibiotics are one class of "antimicrobials", a larger group which also includes anti-viral, anti-fungal, and anti-parasitic drugs. They are relatively harmless to the host, ...

Antibiotic resistance

... Staphylococcus aureus ) or VISA (vancomycin intermediate Staphylococcus aureus ), indicating resistance to all glycopeptide antibiotics. A new class of antibiotics, oxazolidinones , became available in the 1990s, and the first commercially available oxazolidinone, linezolid , is comparable to ...

ATPase

... ATPases are a class of enzymes that catalyze the decomposition of adenosine triphosphate (ATP) into adenosine diphosphate (ADP) and a free phosphate ion . ...

Carbohydrate

... vary however. Oligosaccharides are found as common form of protein posttranslational modification . Polysaccharides represent an important class of biological polymer . Examples include starch , cellulose and chitin . Nutrition Refined grain products are rich sources ...

Cladistics

... A paraphyletic group is similar, but excludes some of the descendants that have undergone significant changes. For instance, the traditional class Reptilia excludes birds even though they evolved from the ancestral reptile. Similarly, the traditional Invertebrates are paraphyletic because ...

Developmental biology

... outside of cells to the cell nucleus. Signal transduction pathways often involve receptors , receptor ligands and enzymes such as tampons. One key class of genes that are differentially regulated by transcription factors in different cell types are genes for cell adhesion proteins. Cell adhesion ...

Dynein

... Dynein is a class of protein found in biological cells and is involved in their reproduction. Dyneins can be divided into two groups: cytoplasmic dynein and ...

Enzyme

... chymotrypsin . Their primary role is for the digestion of food and making nutrients available to all of the body processes which need them. Another class of enzymes is called metabolic enzymes . Their role is to catalyze chemical reactions involving every process in the body, including the ...

Histone

... Classes Six histone classes are known: H1 (sometimes called H5 .) H2A H2B H3 H4 Archaeal histones Two each of class H2A, H2B, H3 and H4 assemble to form one nucleosome , together with DNA. H1 is needed for histone-DNA-complexes to form a 30-nm fiber , which packs ...

Ion channel

... of these six helices are separated by a loop that lines the pore and is the primary determinant of ion selectivity and conductance in this channel class and some others. The channel subunits of one such other class, for example, consist of just this "P" loop and two transmembrane helices. The ...

Lipid

... links Lipids, Membranes and Vesicle Trafficking - The Virtual Library of Biochemistry and Cell Biology IUPAC glossary entry for the lipid class of molecules what is IUPAC? ...

Antibiotic resistance

... Staphylococcus aureus ) or VISA (vancomycin intermediate Staphylococcus aureus ), indicating resistance to all glycopeptide antibiotics. A new class of antibiotics, oxazolidinones , became available in the 1990s, and the first commercially available oxazolidinone, linezolid , is comparable to ...

Plasmid

... incapable of initiating conjugation, hence they can only be transferred with the assistance of conjugative plasmids, by 'accident'. An intermediate class of plasmids are mobilisable , and carry only a subset of the genes required for transfer. These plasmids can 'parasitise' another plasmid, ...

RNA

... the genetic material of some RNA viruses and is involved in some cellular processes, such as RNA interference . Transfer RNA (tRNA) is a small class of RNA molecules that present specific amino acids to the ribosome during translation , the anticodon of the tRNA paits with the codon of on the ...

Rudolf Steiner

... admitted to prepare for the Abitur. Some critics say the Waldorf schools' emphasis on imagination and creativity can sometimes lead to child-led class sessions without focus or direction. To the contrary, Waldorf educators report that it is a highly structured, disciplined educational model. The ...

Species

... of a species given above as taken from Mayr, is somewhat idealistic. Since it assumes sexual reproduction , it leaves the term undefined for a large class of organisms that reproduce asexually. Biologists frequently do not know whether two morphologically similar groups of organisms are "potentially" ...

Taxonomy

... the Organism (as this applies to all living things, it is implied rather than stated explicitly). Below this are the Domain , Kingdom , Phylum , class , Order , Family , Genus , and Species , with various other ranks sometimes inserted. Some have argued that the human mind naturally organizes ...

Thermoregulation

... has done work on the death temperature and paralysis temperature (temperature of heat rigor) of various animals. He found that animals of the same class of the animal kingdom showed very similar temperature values, those from the Amphibia examined being 38.5 C, Fishes 39 C, Reptilia 45 C, and various ...

Transmembrane receptor

... the 7TM superfamily, the transmembrane domain may contain the ligand binding pocket (evidence for this and for much of what else is known about this class of receptors is based in part on studies of bacteriorhodopsin , the detailed structure of which has been determined by crystallography). The ...
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