Which of the following statements is TRUE?
A. Phosphodiesterase converts GMP into cGMP
B. Phosphorylation by protein kinases can stimulate or inhibit the activity of effector proteins.
C. Phospholipase C converts ATP to cAMP.
D. Ca2+ is not a second messenger.
E. Conversion of ATP to cAMP is a phosphorylation reaction.
Answer: B
Anatomy & Physiology
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