G-Protein Signaling Experimental Analysis
During an experiment to study G-protein-linked receptors, a researcher used a ligand known to bind to a specific receptor. They expected an increase in cAMP levels inside the cell but observed no change. They concluded that the receptor does not use cAMP as a second messenger. What could be the mistake in the researcher’s conclusion?
A
G-protein-linked receptors cannot use cAMP as a second messenger; only enzyme-linked receptors can.
B
The researcher’s conclusion was correct; the receptor does not use cAMP as a second messenger.
C
cAMP is not a second messenger in any cell signaling pathways; it serves a different cellular function.
D
The pathway might involve cAMP, but the experimental conditions did not allow for its accumulation or detection.
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