The term down-regulation refers to the process by which
A. a carrier protein increases the rate of degradation for a hormone and thereby decreases its blood concentration.
B. a large amount of hormone shuts down all metabolic activity in a target cell.
C. a carrier protein decreases the rate of degradation of the protein it ferries.
D. a glandular cell decreases the amount of hormone it secretes.
E. a cell decreases the number of receptors it has for a hormone.
Answer: E
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