試題詳解

48. It takes much longer for sex hormones and other steroids to produce their effects than it takes for nonsteroid hormones. ; Why? |
(A) steroids are bigger, slower molecules
(B) steroids usually must be carried longer distances by the blood ^
(C) steroids cause target cells to make new proteins, which takes time
(D) steroids must relay their message via a ; second messenger
(E) it takes longer for endocrine cells to make and secrete steroids ^