Which of the Following Statements Concerning the Action of G

question 30

Multiple Choice

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

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