Question

RNA polymerase II is responsible for the transcription of ____

• A. hnRNA
• B. snRNA
• C. tRNA
• D. rRNA

Hint:

RNA polymerase II is specific for hnRNA, the precursor to mRNA in eukaryotes.

Answer 1

The Correct Option is A

• RNA Polymerase Roles: In eukaryotes, different RNA polymerases transcribe specific RNA types.
  • RNA polymerase II: Transcribes heterogeneous nuclear RNA (hnRNA), which is the precursor to messenger RNA (mRNA).
  • RNA polymerase I: Transcribes ribosomal RNA (rRNA).
  • RNA polymerase III: Transcribes transfer RNA (tRNA) and small nuclear RNA (snRNA).
• Option Analysis:
  • (1) hnRNA: Correct, as RNA polymerase II synthesizes hnRNA.
  • (2) snRNA: Incorrect, transcribed by RNA polymerase III.
  • (3) tRNA: Incorrect, transcribed by RNA polymerase III.
  • (4) rRNA: Incorrect, transcribed by RNA polymerase I.
• Conclusion: The correct answer is (1) hnRNA.