Which molecule is a first messenger but not a second messenger?
A) G protein
B) Cyclic AMP
C) Acetylcholine
D) Protein kinase
E) Adenylyl cyclase

Name: Which molecule is a first messenger but not a second messenger? A) G protein B) Cyclic AMP C) Acetylcholine D) Protein kinase E) Adenylyl cyclase
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Question

Quizplus · Accepted Answer

Acetylcholine is a neurotransmitter that acts as a first messenger by binding to receptors on the cell surface, initiating a signaling cascade. It does not act as a second messenger within the cell.

Which Molecule Is a First Messenger but Not a Second