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
Prev Next
Correct Answer: C

AI Tutor Explanation

Powered by Gemini

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

AI generated content. Review strictly for academic accuracy.

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

More from this Chapter

MCQ_SINGLE
Given below are two statements: Statement I: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Statement II: In phylum Echinodermata, both adults and larvae are radially symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below:
MCQ_SINGLE
An ideal gas is made of polyatomic molecules. Each of the molecules has three translational, three rotational and f number of vibrational modes. If the ratio of heat capacities $C_{P}/C_{V}$ of the gas is $8/7,$ then the value of f is:
MCQ_SINGLE
Consider three media P, Q and R with refractive indices 1, 1.25, and 1.5 respectively. The medium Q having a thickness of 5 cm is placed between extended media P and R as shown in the figure. An object O is placed at the centre of medium Q. If viewed from medium P near the normal direction, the apparent depth of O is $h_1$. For similar observation from medium R, the apparent depth is $h_2$. The value of $|h_{1}-h_{2}|$, in cm, is: [Image Placeholder]
MCQ_SINGLE
Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, +$\alpha$, while the other one has a negative temperature of coefficient, -$\alpha$, as shown in the figure. The current through these circuits are denoted by $I_{A}$ and $I_{B}$. At initial temperature, the resistance of the two resistors is $R_0$. As the temperature is increased, the correct option that describes the variation of current in these circuits is:
MCQ_SINGLE
Given below are two statements: Statement I: Plasmids are autonomously replicating DNA. Statement II: Plasmids are extrachromosomal DNA. In the light of the above statements, choose the most appropriate answer from the options given below:
View All Questions