Category: A

A ribonucleoside 5 ‘-diphosphate serving as phosphate-group acceptor in the cell energy cycle. A compound (ester) composed of one molecule each of adenine and D-ribose and two molecules of phosphoric acid is formed as a result of the breakdown of adenosine triphosphate and is used in the resynthesis of adenine triphosphate, adenosine triphosphatase (ATPase). A…

Genes that interact but do not show dominance (in the case of alleles) or epistasis (if they are not alleles).  

Short-term infection of cells with DNA.  

The factor by which the concentration of a solute must be multiplied to give its true thermodynamic activity. A factor used in potentiometry to describe the activity of free ions in solution.  

The region of an enzyme surface that binds the substrate molecule and transforms the substrate molecule into the new (chemical) product (entity). This site is usually located not on a protruding portion of the enzyme, but rather in a cleft or depression. This establishes a controlled environment in which the reaction may occur. A three-dimensional…

A small molecule that stimulates (increases) an enzyme’s catalytic activity when it binds to an allosteric site. In chemistry, any substance, usually a particular metal on that is very low concentration significantly accelerates the speed of a chemical reaction. A substance in the body that converts an inactive molecule into an active agent, such as…

The amount of energy (calories) required to bring all the molecules in one mole of a reacting substance to the transition state. More simply, it may also be viewed as the energy required to bring reacting molecules to a certain energy state from which point the reaction proceeds spontaneously.  

A disease in which a specific virus attacks and kills macrophages and helper T cells (thus causing collapse of the entire immune system). Once the immune system has been inactivated, other diseases, which under normal circumstances can be fought off, become fatal. Caused by HIV (human immunodeficiency virus), AIDS leads to potentially fatal depression of…

It binds acyl intermediates during the formation of long-chain fatty acids. ACP is important in that it is involved in every step of fatty acid synthesis. A protein that has pantothenic acid as its prosthetic group. It is active in fatty acid synthesis as it carries the acyl groups that are bound to the CoA…

The addition of germ-plasm deposits to existing germ-plasm storage bands.