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

Verified
Correct Answer:
Verified
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