In cell signaling, what is the role of a second messenger such as cyclic AMP?
Answer and explanation
Correct answer: B. It relays and amplifies the signal inside the cell
- Step 1: The first messenger binds a receptor at the cell surface. Step 2. The second messenger spreads the message inside the cell. Answer: it relays and amplifies the signal inside. Why not the others: Receptor binding initiates reception, ligand release occurs during signal termination, and nuclear transcription factors execute downstream cellular responses rather than second messenger relay.
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