Question:
Identify the group which correctly represents secondary messengers involved in hormone action.
Identify the group which correctly represents secondary messengers involved in hormone action.
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Second messengers are small molecules such as cAMP and calcium ions.
Updated On: Nov 12, 2026
- ATP, DNA, RNA
- cAMP, \(\text{Ca}^{++}\), cGMP, \(\text{IP}_{3}\)
- ACTH, TSH, FSH
- Adenylate cyclase, Phospholipase C, Protein kinase A.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Water-soluble hormones act on cell surface receptors, so the hormone is the first messenger.
Step 2: Second messengers
The binding creates small molecules inside the cell: cAMP, cGMP, \(\text{IP}_3\), \(\text{Ca}^{++}\) and DAG. They change cell activity.
Step 3: Eliminate
ATP, DNA and RNA are not messengers. ACTH, TSH and FSH are hormones. Adenylate cyclase, phospholipase C and protein kinase A are enzymes.
Step 4: Conclusion
The group of secondary messengers is cAMP, \(\text{Ca}^{++}\), cGMP and \(\text{IP}_3\).
Final Answer:
The secondary messengers are cAMP, Ca, cGMP and IP3. \[ \boxed{\text{(B) }\text{cAMP, Ca}^{++}\text{, cGMP, IP}_{3}} \]
Water-soluble hormones act on cell surface receptors, so the hormone is the first messenger.
Step 2: Second messengers
The binding creates small molecules inside the cell: cAMP, cGMP, \(\text{IP}_3\), \(\text{Ca}^{++}\) and DAG. They change cell activity.
Step 3: Eliminate
ATP, DNA and RNA are not messengers. ACTH, TSH and FSH are hormones. Adenylate cyclase, phospholipase C and protein kinase A are enzymes.
Step 4: Conclusion
The group of secondary messengers is cAMP, \(\text{Ca}^{++}\), cGMP and \(\text{IP}_3\).
Final Answer:
The secondary messengers are cAMP, Ca, cGMP and IP3. \[ \boxed{\text{(B) }\text{cAMP, Ca}^{++}\text{, cGMP, IP}_{3}} \]
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