試題詳解

15. Lipid-soluble signaling molecules, such as aldosterone, can diffuse across the cell membranes but affect only target cells because?
(A) Only target cells have responsive DNA segments
(B) Only target cells have enzymes that convert aldosterone to active form
(C) Aldosterone-responsive genes are only present in the target cells
(D) Intracellular receptors are present only in target cells