| adenosine | (n) (biochemistry) a nucleoside that is a structural component of nucleic acids; it is present in all living cells in a combined form as a constituent of DNA and RNA and ADP and ATP and AMP |
| adenosine deaminase | (n) an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia, Syn. ADA, Example: ADA deficiency can lead to one form of severe combined immunodeficiency disease; the gene encoding ADA was one of the earlier human genes to be isolated and cloned for study |
| adenosine diphosphate | (n) an ester of adenosine that is converted to ATP for energy storage, Syn. ADP |
| adenosine monophosphate | (n) a nucleotide found in muscle cells and important in metabolism; reversibly convertible to ADP and ATP, Syn. adenylic acid, AMP |
| adenosine triphosphate | (n) a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular reactions, Syn. ATP |