The signaling molecule nitric oxide (NO) functions
A) by binding its cell surface receptor and triggering an intracellular signaling cascade.
B) by diffusing across the membrane and binding its intracellular receptor, which then activates transcription.
C) on cells located far from the cells where it was synthesized.
D) by diffusing across the cell membrane and changing the activities of intracellular enzymes.
Correct Answer:
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