NEETZoologyMolecular Basis of Inheritance
In eukaryotes, the transcription of tRNA, 5S rRNA, and snRNAs is catalyzed by which of the following enzymes?
Options
- ARNA polymerase I
- BRNA polymerase II
- CRNA polymerase III
- DDNA-dependent DNA polymerase
Correct answer
C. RNA polymerase III
Step-by-step solution
In eukaryotes, there is a clear division of labor among the RNA polymerases in the nucleus. RNA polymerase I transcribes rRNAs (28S, 18S, and 5.8S). RNA polymerase II transcribes the precursor of mRNA, the heterogeneous nuclear RNA (hnRNA). RNA polymerase III is responsible for the transcription of tRNA, 5S rRNA, and snRNAs (small nuclear RNAs). DNA-dependent DNA polymerase is involved in DNA replication, not transcription. Answer: RNA polymerase III