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Cell membranes have several different functions. For instance, insulin does not enter a target cell but instead binds to a specific membrane receptor on the external surface of the membrane, thereby activating the enzyme adenylyl cyclase on the inner membrane surface.

Which of the following membrane functions is BEST illustrated by this observation about insulin?

A

Permeability barrier.

B

Localization of function.

C

Regulation of transport.

D

Detection of signals.

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