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In eukaryotes, which RNA polymerase transcribes the precursor of mRNA (hnRNA)?
A{'text': 'RNA polymerase I', 'label': 'A'}
B{'text': 'RNA polymerase II', 'label': 'B'}
C{'text': 'RNA polymerase III', 'label': 'C'}
D{'text': 'RNA polymerase IV', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'RNA polymerase II', 'label': 'B'}
Eukaryotes have three nuclear RNA polymerases: pol I makes rRNAs (28S, 18S, 5.8S), pol II makes hnRNA (mRNA precursor), and pol III makes tRNA, 5S rRNA and snRNAs.
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