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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
Category:
Physiology MCQs
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