In a hormone-stimulated signaling system, the concentration of hormone exposed to the receptor is
A) always equal to the receptor Kd for binding the hormone.
B) never equal to the receptor Kd for binding the hormone.
C) below the receptor Kd for binding the hormone before stimulation of hormone secretion.
D) above the receptor Kd for binding the hormone before stimulation of hormone secretion.
E) always constant.
Answer: C
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