試題詳解

2. Which of the following statements regarding G protein or G protein-mediated signal transduction is false?

(1) GTP binds the beta submit of the trimeric G proteins.

(2) C-terminus of G protein-coupled receptor is on the cytoplasmic face of the membrane. 

(3) Epinephrine binding to the b-adrenergic receptor causes an activation of adenylyl cyclase through the activation of a stimulatory G protein.
(A) (1)
(B) (2)
(C) (3)
(D) (1) and (3)
(E) (2) and (3)