Lipid-soluble signaling molecules, such as aldosterone, cross the membranes of all cells but affect only target cells because ________.
A) only target cells retain the appropriate DNA segments
B) intracellular receptors are present only in target cells
C) only target cells have enzymes that break down aldosterone
D) only in target cells is aldosterone able to initiate the phosphorylation cascade that turns genes on

Question

Quizplus · Accepted Answer

Intracellular receptors that can bind to lipid-soluble signaling molecules like aldosterone are present only in target cells. This specificity allows the hormone to affect only those cells that have the necessary receptors to recognize and respond to the hormone.

Lipid-Soluble Signaling Molecules, Such as Aldosterone, Cross the Membranes of All