NEET 2026 ALL Q #2073
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Which of the following enzymes synthesizes precursor of mRNA, the heterogeneous nuclear RNA (hnRNA)?
(A) DNA polymerase
(B) RNA polymerase I
(C) RNA polymerase II
(D) RNA polymerase III
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Correct Answer: C

AI Tutor Explanation

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Detailed Solution

Step 1: Understanding Eukaryotic Transcription

In eukaryotic cells, transcription is a complex process involving three distinct types of RNA polymerases, each responsible for synthesizing specific types of RNA molecules.

Step 2: Analyzing RNA Polymerase Functions

The roles of the three RNA polymerases are as follows:

  • RNA polymerase I: Transcribes rRNAs (28S, 18S, and 5.8S).
  • RNA polymerase II: Transcribes the precursor of mRNA, which is known as heterogeneous nuclear RNA (hnRNA).
  • RNA polymerase III: Transcribes tRNA, 5S rRNA, and snRNA (small nuclear RNA).

Step 3: Conclusion

Since the question asks for the enzyme responsible for synthesizing hnRNA, RNA polymerase II is the correct enzyme.

Final Answer: RNA polymerase II

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must retrieve specific biological knowledge regarding enzyme nomenclature and apply it to identify the correct functional match for hnRNA synthesis.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific biological facts and definitions found in the NCERT Biology textbook regarding molecular biology.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE. This question is a direct retrieval task from the 'Molecular Basis of Inheritance' chapter, which is a high-weightage topic in the NEET syllabus.
||KEY:C

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