Which of the following statements concerning the action of G proteins on adenylate cyclase is true?
(I)G proteins always serve to activate adenylate cyclase.
(II)G proteins always serve to inhibit adenylate cyclase.
(III)Some G proteins activate adenylate cyclase,while others inhibit it.
(IV)G proteins do not act on adenylate cyclase at all.
A)I only
B)II,III
C)I,III
D)II only
E)III only

Question

Quizplus · Accepted Answer

G proteins can either activate or inhibit adenylate cyclase depending on their type, meaning that some G proteins increase the production of cAMP by activating adenylate cyclase, while others decrease cAMP levels by inhibiting adenylate cyclase.

Which of the Following Statements Concerning the Action of G