Question:
Given below are two statements about hnRNA processing:
Statement I: Capping occurs by addition of methyl adenosine triphosphate to the 5' end.
Statement II: During tailing, about 200-300 adenylate residues are added to its 3' end.
Given below are two statements about hnRNA processing:
Statement I: Capping occurs by addition of methyl adenosine triphosphate to the 5' end.
Statement II: During tailing, about 200-300 adenylate residues are added to its 3' end.
Statement I: Capping occurs by addition of methyl adenosine triphosphate to the 5' end.
Statement II: During tailing, about 200-300 adenylate residues are added to its 3' end.
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Capping uses Guanosine; Tailing uses Adenosine. (G at the start, A at the end).
Updated On: May 14, 2026
- Both Statement I and Statement II are true.
- Both Statement I and Statement II are false.
- Statement I is true but Statement II is false.
- Statement I is false but Statement II is true.
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The Correct Option is D
Solution and Explanation
Step 1: Concept
Processing of heterogeneous nuclear RNA (hnRNA) into mature mRNA involves capping, tailing, and splicing.
Step 2: Meaning
Capping happens at the 5' end, and tailing happens at the 3' end.
Step 3: Analysis
Statement I is false because the cap is 7-methylguanosine triphosphate (m7G), not adenosine. Statement II is true: polyadenylation adds a "Poly-A tail" of several hundred adenylate residues to protect the mRNA.
Step 4: Conclusion
As the identity of the capping nucleotide is wrong but the tailing description is correct, Option D is the answer. Final Answer: (D)
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