NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Zoology
- Chapter
- Molecular Basis of Inheritance
NEET 2026 · Zoology · Molecular Basis of Inheritance
Which of the following enzymes synthesizes precursor mRNA ?
Which of the following enzymes synthesizes precursor mRNA ?
Options
- ADNA polymerase
- BRNA polymerase I
- CRNA polymerase II
- DRNA polymerase III
Correct answer
C. RNA polymerase II
Step-by-step solution
In eukaryotes, there are three major types of RNA polymerases:
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 is responsible for the transcription of tRNA, 5S rRNA, and snRNAs.
Therefore, RNA polymerase II synthesizes precursor mRNA.
Answer: RNA polymerase II
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 is responsible for the transcription of tRNA, 5S rRNA, and snRNAs.
Therefore, RNA polymerase II synthesizes precursor mRNA.
Answer: RNA polymerase II