Which of the following is a TRUE statement?
A) All protein kinases are activated by cyclic AMP.
B) The subunit of the protein kinase that binds cyclic AMP is the catalytic subunit.
C) Caffeine increases the rate of cyclic AMP degradation.
D) Hormones activate adenylate cyclase by binding directly to the adenylate cyclase molecule.
E) The enzyme that inactivates cyclic AMP is a phosphodiesterase.

Question

Quizplus · Accepted Answer

It is true that the enzyme that inactivates cyclic AMP is a phosphodiesterase. Option A is false because not all protein kinases are activated by cyclic AMP. Option B is false because it is the regulatory subunit that typically binds cyclic AMP, not the catalytic subunit. Option C is false because caffeine actually inhibits cyclic AMP degradation. Option D is false because hormones activate adenylate cyclase by binding to receptors on the plasma membrane, not directly to the adenylate cyclase molecule.

Which of the Following Is a TRUE Statement