試題詳解

4. What is the mechanism by which testosterone functions inside a cell?
(A) It acts as a signal receptor that activates tyrosine kinases.
(B) It binds with a receptor protein that enters the nucleus and activates the expression of specific genes.
(C) It cooperates with a membrane receptor to response to drug treatment.
(D) It acts as a steroid signal receptor that activates ion channel proteins in the plasma membrane.
(E) It coordinates a phosphorylation cascade that reduces spermatogenesis.