Which of the following is NOT true of G-protein complex action?
A. Stimulates a cell by opening ion channels in the plasma membrane
B. Stimulates a cell by means of intracellular chemical signals
C. Acts as an intermediate between a receptor and other cellular proteins
D. Stimulates a cell by means of extracellular chemical signals
E. Stimulates a cell by activating enzymes associated with the plasma membrane
Answer: D
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