A key is placed into a keyhole then turned and the door opens.When considering the components of cell signaling,the action of turning the key would best correspond to
A)the concentration of the hormone.
B)the cell response that occurs when the receptor binds the hormone.
C)the binding site of the receptor.
D)conformational change in the receptor once bound to the hormone.
E)signal transduction that occurs when the receptor binds the hormonE.

Question

Quizplus · Accepted Answer

The action of turning the key corresponds to the conformational change in the receptor once bound to the hormone, which is represented by choice D. Just like how a key must be turned to unlock a door, a hormone must bind to its specific receptor and cause a conformational change for the signal to be transmitted and reach the cell's response.

A Key Is Placed into a Keyhole Then Turned and the Door