RNA polymerase I synthesizes
Question and options
RNA polymerase I synthesizes
- siRNA
- tRNA
- pre-rRNA
- mRNAs and small nuclear RNAs
Answer and explanation
Correct answer: C - pre-rRNA
RNA polymerase I transcribes only the large pre-rRNA (45S, giving 28S, 18S, 5.8S rRNA); Pol II makes mRNA/snRNAs and Pol III makes tRNA and 5S rRNA.
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