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

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Quizplus · Accepted Answer

The concentration of hormone exposed to the receptor is typically below the receptor's Kd (dissociation constant) for binding the hormone before stimulation of hormone secretion. This is because the Kd represents the concentration at which half of the receptors are bound by the hormone, and before stimulation, hormone levels are usually low to prevent constant activation of the signaling pathway.

In a Hormone-Stimulated Signaling System,the Concentration of Hormone Exposed to the Receptor