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Active in Biological Definition

Active site

... The active site of an enzyme is the binding site where ... The structure and chemical properties of the active site allow the recognition and binding of the substrate . The active site in many enzymes can be inhibited or ...

Active transport

... active transport is the mediated transport of ... transport of another. Primary Primary active transport directly uses energy to transport ... cell potential . Secondary In secondary active transport, there is no direct coupling of ATP; ...

Allostery

... scenario in which an enzyme's allosteric and active sites are distinct. Contents ... collides with a molecule of substrate, the active site essentially forms a glove around its ... effector. The allosteric, or "other," site is the active site of an adjoining protein subunit . The ...

Allostery

... scenario in which an enzyme's allosteric and active sites are distinct. Contents ... collides with a molecule of substrate, the active site essentially forms a glove around its ... effector. The allosteric, or "other," site is the active site of an adjoining protein subunit . The ...

Antibiotic

... to be due to its conversion in the host to the active form, sulfanilimide . By today's more broad ... in producing usable quantities of the purified active ingredient which were quickly tested on clinical ... nations. By 1984 half the people with active tuberculosis in the United States had a ...

Barr body

... inert, but in fact a small number of genes remain active and expressed in some species. These genes are ... RNAs , of which only two are known to play an active role in the X inactivation process, Xist and ... Xist around the Xic . Meanwhile, on the future active X Tsix levels are maintained; thus the levels ...

Enzyme

... sites where the substrate (s) attach, and active site (s), where the amino acids perform the ... of an enzyme tends to consist of one or more active sites, separated by stretches whose purpose is mainly to position the active regions correctly. Because the precise structure ...

Cell membrane

... membranes 3.1 Passive transport 3.2 active transport 4 References 5 External ... energy, and increases entropy in a system. Unlike active transport, this process does not involve chemical energy ( ATP ). active transport Typically moves molecules against ...

Osmoregulation

... Osmoregulation is the active regulation of the osmotic pressure of body ... to their environment . It can either be active or passive. An example are marine fish. By ... the intracellular fluid by both diffusion and active transport. As osmotic action pushes water from ...

Cell membrane

... membranes 3.1 Passive transport 3.2 active transport 4 References 5 External ... energy, and increases entropy in a system. Unlike active transport, this process does not involve chemical energy ( ATP ). active transport Typically moves molecules against ...

Rudolf Steiner

... This School, which has become increasingly active since Steiner's day, is structured like a ... economics. This school has become increasingly active since Steiner's day. Architecture, ... a period after World War I, Steiner was extremely active and well-known in Germany in part because in many ...

Thermoregulation

... the production of heat, and hence the more active the body the greater the production of heat. ... incidence of day and night; in monkeys which are active during the night and resting during the day, the ... work, which are discussed later. Even from very active exercise the temperature does not rise more than ...

Carbohydrate

... supports a hydroxyl group (except for the first and last) is optically active , allowing a number of different carbohydrates with the same basic ... form. It should be noted that the ring form has one more optically active carbon than the straight-chain form, and so has both an alpha and a ...

Cell growth

... for nutrient storage can have a smooth surface membrane, but metabolically active large cells often have some sort of folding of the cell surface membrane ... division. In Wee1 mutants, there is less Wee1 activity and Cdc2 becomes active in smaller cells, causing cell division before the yeast cells reach their ...

Competitive inhibitor

... inhibition. In competitive inhibition , the molecule acts on the same active site as the normal enzyme substrate . The substrate molecules cannot enter the active site while the inhibitor is there, and inhibitors cannot enter the site ...

Diffusion

... and no additional energy has to be supplied. Compare with diffusion and active transport. Net flux Net flux is used to measure diffusion. ... thermal conductivity and the temperature gradient. See also active transport Barotropic vorticity equation Bipolar junction ...

Insulin

... – that is later transformed by proteolytic action into the active hormone. The remaining part is called C-peptide . This polypeptide is ... None is currently close to clinical approval. Inhaled insulin is under active investigation as are several other, more exotic, techniques. Dosage ...

Passive transport

... and other atomic or molecular substances, across membranes . Unlike active transport , this process does not involve chemical energy . Passive ... as moving solutes "down the concentration gradient" (compared with active transport , which often moves material from area of low concentration to ...

Synapse

... The parts of synapses where neurotransmitter is released are called the active zones . At active zones the membranes of the two adjacent cells are held in close contact by ...

X chromosome

... chromosome in each body cell. Identifying genes on each chromosome is an active area of genetic research. Because researchers use different approaches to ... & Willard 2005) suggests that the Barr body may be more biologically active that was previously supposed. Role in disease Numerical ...

Allele

... and "purple" alleles for petal color, the resulting offspring would have violet petals. Another exception is co-dominance , where both alleles are active and both traits are expressed at the same time; for example, both red and white petals in the same bloom or red and white flowers on the same plant. ...

Amino acid

... Glycine hydrophilic 75.07 6.06 2.35 9.78 Because of the two hydrogen atoms at the α carbon, glycine is not optically active . H His Histidine basic 155.16 7.60 1.80 9.33 6.04 In even slightly acidic conditions protonation of the ...

Apoptosis

... ATP which then binds to pro-caspase-9, creating a multi-protein complex known as apoptosome. The apoptosome cleaves this pro-caspase rendering the active form of caspase-9, which in turn activates effector caspase-3. ( See also the articles on caspases and the Bcl-2 protein family ). The whole ...

ATPase

... is, from the side of the membrane where they are in low concentration to the side where they are in high concentration. This process is considered active transport . ATP synthetase The ATP synthetase (or ATP synthase ) of mitochondria and chloroplasts is an anabolic enzyme that harnesses ...

Biomechanics

... such as elastic modulus , would be different. Chemistry , molecular biology , and cell biology have much to offer in the way of explaining the active and passive properties of living tissues. For example, the binding of myosin to actin is based on the biochemical reaction, where C a 2 + ...

Bone

... and their functions are to make osteoid and manufacture hormones such as prostaglandin which act on bone itself. Osteoblasts are mononucleate. active osteoblasts are situated on the surface of osteoid seams* and communicate with each other via gap-junctions. They contain alkaline phosphatase - a ...

Cancer

... (wasting), excessive sweating ( night sweats ), anemia , and specific paraneoplastic phenomena , i.e. specific conditions that are due to an active cancer, such as thrombosis or hormonal changes. Every single item in the above list has a substantial differential diagnosis (it may be ...

Cell biology

... Separation of different organelles by centrifugation . Proteins extracted from membranes by detergents and salts . See also active transport Adhesion Chloroplast Cilia Cytoplasm Cytoskeleton Endoplasmic reticulum Flagella Glycolysis Golgi ...

Centromere

... See also: Genetics -- Cell biology External links Report about Nature Genetics article that centromere of rice genome carries active genes * Science . 2002 Sep 13;297(5588):1818-9. ...

Charles Darwin

... Munro III and his revulsion at the brutality of surgery at the time led him to neglect his medical studies, but in his second year he became active in student societies for naturalists. In the Plinian society he became an avid student of Robert Edmund Grant , learning from Grant's enthusiasm for ...

Coenzyme

... coenzymes, such as heme coenzymes in catalytic hemoproteins . Coenzymes covalently or non-covalently bind to the inactive apoenzyme to form the active holoenzyme . ...

Ion gradient

... can be used as an intermediate energy storage for heat production and flagellar rotation . Additionally it is an interconvertible form of energy in active transport, electron potential generation, NADPH synthesis and ATP synthesis/hydrolysis. Some archaea , most notably halobacteria , make ...

Cooperativity

... is a phenomenon in biology displayed by enzymes or receptors that have multiple binding sites . When substrate bonds to the active site of one enzymatic subunit, the rest of the subunits are stimulated and become active. ...

Warm-blooded

... , and insects . The advantages of endothermy are increased enzyme activity and a constant body temperature, allowing these animals to be active in cold temperatures. On the other hand, the disadvantage is the need to maintain thermoregulation , even during inactivity, otherwise the organism ...

Ethyl alcohol

... 2 Production 3 Use 4 See also 5 External links History Ethanol has been known to humans since prehistory as the active ingredient of alcoholic beverages . Its isolation as a relatively pure compound was probably achieved first by Islamic alchemists who developed ...

Evolution

... descent comes from genetic detritus such as pseudogenes , regions of DNA which are orthologous to a gene in a related organism, but are no longer active and appear to be undergoing a steady process of degeneration [6] . Since metabolic processes do not leave fossils, research into the evolution of ...

Facilitated diffusion

... across the membrane, where it is released. The protein then returns to its original shape, to wait for more molecules to transport. In contrast to active transport , facilitated diffusion does not require energy and carries molecules or ions down a concentration gradient. ...

Hardy-Weinberg principle

... , or genetic drift . Assortative mating will only change the genotype frequencies of those genes that are desired. Genetic drift is particularly active in small population sizes . Deviations caused by selection, however, often require a significant selection coefficient in order to be detected ...

Histone

... , ubiquitination , and ADP -ribosylation. This effects their function of gene regulation (see functions). In general, genes that are active have less bound histone, while inactive genes are highly associated with histones during interphase . It also appears that the structure of ...

Photosynthesis

... level Photosynthesis produces more energy for certain wavelengths of light. In plants, there are two photosystems involved, which are most active at 700 and 680 nm . However, other wavelengths are also peaks in the action spectrum for photosynthesis. Photosynthesis begins when light ionizes ...
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