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 binding site of the receptor.
B. signal transduction that occurs when the receptor binds the hormone.
C. the concentration of the hormone.
D. the cell response that occurs when the receptor binds the hormone.
E. conformational change in the receptor once bound to the hormone.


Answer: E

Biology & Microbiology

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