Heterotrimeric G proteins
I. consist of three subunits, Ga, Gß, and G?.
II. function as an autoinhibtory segment.
III. can function as a mediator to adenylate cyclase activity.
IV. are anchored to the cytoplasmic side of the membrane.
A) I, II, IV
B) I, III, IV
C) I, IV
D) I, III
E) I only
Answer: B) I, III, IV
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