Once a hormone activates the enzyme adenylyl cyclase, ATP is converted to cAMP, which in turn

A) activates protein kinase.
B) inhibits phosphodiesterase.
C) initiates more cAMP production.
D) initiates protein synthesis.
E) inhibits protein synthesis.

Adenylyl Cyclase

Adenylyl cyclase is an enzyme found in many organisms that catalyzes the conversion of adenosine triphosphate (ATP) to cyclic adenosine monophosphate (cAMP), a second messenger important in many biological processes.

cAMP

Cyclic adenosine monophosphate, a second messenger important in many biological processes, including the regulation of glycogen, sugar, and lipid metabolism.

Protein Kinase

An enzyme that modifies other proteins by chemically adding phosphate groups to them, playing a critical role in many cellular processes.