試題詳解

3. Only certain cells in the body are target cells for the steroid hormone aldosterone. Which of the following is the best explanation for why these are the only cells that respond to this hormone?
(A) Only target cells are exposed to aldosterone.
(B) Only target cells contain receptors for aldosterone.
(C) Aldosterone is unable to enter nontarget cells.
(D) Nontarget cells destroy aldosterone before it can produce its effect.
(E) Nontarget cells convert aldosterone to a hormone to which they do respond.