Which statement is true about up-regulation and down-regulation?
A. Up-regulation is the increase in the number of receptors for a given hormone and down-regulation is the decrease in the amount of hormone.
B. Up-regulation is the increase in the amount of hormone and down-regulation is the decrease in the amount of hormone.
C. Up-regulation is the increase in the number of receptors for a given hormone and down-regulation is the decrease in the number of receptors for a hormone.
D. Up-regulation is the decrease in the number of receptors for a given hormone and down-regulation is the increase in the number of receptors for a hormone.
Answer: C
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