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(cryogenics) the lowest temperature theoretically attainable (at which the kinetic energy of atoms and molecules is minimal); 0 Kelvin or -273.15 centigrade or -459.67 Fahrenheit absolute zero
RNA molecules present in the cell (in at least 20 varieties, each variety capable of combining with a specific amino acid) that attach the correct amino acid to the protein chain that is being synthesized at the ribosome of the cell (according to directio acceptor RNA , soluble RNA , transfer RNA , tRNA
any organic compound formed by adding alcohol molecules to aldehyde molecules acetal
accumulation of molecules of a gas to form a thin film on the surface of a solid adsorption , surface assimilation
oily colorless liquid obtained by the condensation of two molecules of acetaldehyde; contains an alcohol group (-OH) and an aldehyde group (-CHO) aldehyde-alcohol , aldol
complex inorganic compound that contains ammonia molecules ammine
class of synthetic detergents in which the molecules do not ionize in aqueous solutions anionic , anionic detergent , non-ionic detergent
timepiece that derives its time scale from the vibration of atoms or molecules atomic clock
unit of mass for expressing masses of atoms or molecules atomic mass unit
principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules Avogadro's hypothesis , Avogadro's law
number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000) Avogadro's number , Avogadro number
lymphocyte derived from bone marrow that provides humoral immunity; it recognizes free antigen molecules in solution and matures into plasma cells that secrete immunoglobulin (antibodies) that inactivate the antigens B cell , B lymphocyte
(physics) a law expressing the distribution of energy among the molecules of a gas in thermal equilibrium Boltzmann distribution law , Maxwell-Boltzmann distribution law
3-dimensional geometric arrangement of the atoms or molecules or ions composing a crystal Bravais lattice , crystal lattice , space lattice
essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain carbohydrate , saccharide , sugar
compounds composed of 1 carbon and 4 halogen molecules carbon tetrahalide
metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs cellular respiration , internal respiration , respiration
any natural phenomenon involving chemistry (as changes to atoms or molecules) chemical phenomenon
produced by or used in a reaction involving changes in atoms or molecules chemical , chemical substance
breaking of a chemical bond in a molecule resulting in smaller molecules cleavage
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