Question:
Which one is not a second messenger?
Which one is not a second messenger?
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Second messengers are small signaling molecules, not carriers of genetic code.
Updated On: Jul 4, 2026
- cAMP
- mRNA
- Inositol triphosphate
- Ca++
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The Correct Option is B
Solution and Explanation
Step 1: Second messengers are small molecules or ions that relay a signal from a receptor on the cell surface to targets inside the cell.
Step 2: cAMP, inositol triphosphate (IP3) and Ca++ are all classic second messengers used in hormone and signal transduction pathways.
Step 3: mRNA carries genetic information for protein synthesis, it does not act as a signaling molecule in a receptor pathway, so it is not a second messenger.
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