Question
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The transcripts of RNA polymerases I and III are not processed.
Reason (R): RNA polymerases I and III lack a C-terminal domain (CTD).
In the light of the above statements, choose the most appropriate answer from the options given below:
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
(A) is not correct but (R) is correct.
RNA Polymerase Transcript Processing & CTD Analysis
Assertion (A) Analysis:
- The statement asserts that transcripts from RNA Polymerases I and III are not processed.
- Fact Check: This is incorrect. RNA Polymerase I transcribes precursor rRNA, which undergoes significant processing (cleavage and modification). RNA Polymerase III transcribes tRNA and 5S rRNA; tRNA precursors are also processed, involving cleavage and modification.
- Therefore, Assertion (A) is incorrect.
Reason (R) Analysis:
- The statement claims RNA Polymerases I and III lack a C-terminal domain (CTD).
- Fact Check: This refers to the specific, highly repeated CTD found in RNA Polymerase II, which is critical for coordinating transcription with RNA processing (capping, splicing, polyadenylation). RNA Polymerases I and III do not possess this characteristic CTD.
- Therefore, Reason (R) is correct in this context.
Conclusion
Based on the analysis, Assertion (A) is incorrect, while Reason (R) is correct. This aligns with option D.
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