The ability of a hormone to affect the activities of a particular cell depends on that cell having specific receptors with which the hormone molecules can bind. The number of receptors present in a target cell is a constant, invariable number.
A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second is false.
D) The second statement is true; the first is false.

Question

Quizplus · Accepted Answer

The first statement is true because hormones indeed exert their effects on cells by binding to specific receptors on those cells. The second statement is false because the number of receptors on a target cell can vary, being upregulated or downregulated in response to various factors, not a constant, invariable number.

The Ability of a Hormone to Affect the Activities of a Particular