The best understood intracellular messenger is cyclic AMP (cAMP). Which of the following statement(s) concerning this intracellular messenger is/are correct?
A. Intracellular cyclic AMP is constantly degraded by a specific enzyme, cAMP phosphodiesterase
B. Most of the actions of cAMP are mediated by activation of protein kinase A
C. Intracellular levels of cAMP are relatively stable and change solely in response to activation of adenylate cyclase
D. cAMP is the only cyclic nucleotide active as an intracellular messenger
Answer:A
The best understood intracellular messenger is cyclic AMP (cAMP). Which of the following statement(s) concerning this intracellular messenger is/are correct?
A. Intracellular cyclic AMP is constantly degraded by a specific enzyme, cAMP phosphodiesterase B. Most of the actions of cAMP are mediated by activation of protein kinase A C. Intracellular levels of cAMP are relatively stable and change solely in response to activation of adenylate cyclase D. cAMP is the only cyclic nucleotide active as an intracellular messenger