Which RNA polymerase transcribes rRNA in eukaryotes?

Study for the A2 Genetic Control of Proteins Test. Engage with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Which RNA polymerase transcribes rRNA in eukaryotes?

Explanation:
RNA polymerase I transcribes rRNA genes in eukaryotes. It works in the nucleolus to produce the 45S pre-rRNA, which is processed into the mature 18S, 5.8S, and 28S rRNAs that form the ribosome’s core. In contrast, RNA polymerase II makes mRNA and many snRNAs, while RNA polymerase III transcribes 5S rRNA and tRNAs. Pol IV is a plant-specific polymerase involved in RNA silencing rather than ribosomal RNA transcription. So the enzyme that transcribes rRNA in eukaryotes is RNA polymerase I.

RNA polymerase I transcribes rRNA genes in eukaryotes. It works in the nucleolus to produce the 45S pre-rRNA, which is processed into the mature 18S, 5.8S, and 28S rRNAs that form the ribosome’s core. In contrast, RNA polymerase II makes mRNA and many snRNAs, while RNA polymerase III transcribes 5S rRNA and tRNAs. Pol IV is a plant-specific polymerase involved in RNA silencing rather than ribosomal RNA transcription. So the enzyme that transcribes rRNA in eukaryotes is RNA polymerase I.

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