Most of the effects of cyclic AMP (cAMP) in the cell are mediated by

Question

Quizplus · Accepted Answer

The most common and well-known mediator of cAMP effects in the cell is Protein Kinase A (PKA), which is activated by binding of cAMP to its regulatory subunits, leading to the release and activation of its catalytic subunits. This activation of PKA then triggers a cascade of downstream effects, including changes in gene expression, ion channel activity, and other signaling pathways. Therefore, choice A is the best answer. Choices B and C are incorrect because cAMP is not directly involved in regulating ion channels or PKC activity. Choice D is incorrect because cAMP phosphodiesterase is actually an enzyme that breaks down cAMP, rather than mediating its effects.

Most of the Effects of Cyclic AMP (CAMP) in the Cell