Which of the following is the last step in the sequence of events happening when cyclic AMP acts as a second messenger?
A. G protein is activated by the binding of a hormone to the receptor
B. Enzymes are activated or deactivated by the action of protein kinases
C. Adenylate cyclase produces cAMP
D. G protein activates adenylate cyclase
E. cAMP activates protein kinases
Answer: B
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