試題詳解

56. Testosterone functions inside a cell by _____.
(A) acting as a signal receptor that activates ion-channel proteins
(B) binding with a receptor protein that enters the nucleus and activates specific genes
(C) acting as a steroid signal receptor that activates ion-channel proteins
(D) becoming a second messenger that inhibits adenylyl cyclase
(E) coordinating a phosphorylation cascade that increases glycogen metabolism