Which of the following statements is true?
A)Phosphorylation by protein kinase can stimulate or inhibit the activity of effector proteins
B)Ca2+ and cyclic AMP are second messengers
C)Phosphodiesterase converts GMP into cGMP
D)Both phosphorylation by protein kinase can stimulate or inhibit the activity of effector proteins and Ca2+ and cyclic AMP are second messengers are true
E)All of the choices are true

Question

Quizplus · Accepted Answer

Phosphorylation by protein kinase can stimulate or inhibit the activity of effector proteins, and Ca2+ and cyclic AMP are examples of second messengers. However, phosphodiesterase converts cGMP into GMP, not the other way around, so choice C is false. Therefore, the correct answer is D.

Which of the Following Statements Is True