alleryStart learning →Which set of products belongs to RNA polymerase III?
AAll rRNAs other than the 5S rRNA
BNuclear pre-mRNAs and their introns
CThe 18S and 28S rRNAs alone
D5S rRNA, tRNAs and small nuclear RNAs
Answer & Solution
Correct answer: D. 5S rRNA, tRNAs and small nuclear RNAs
1. RNA polymerase III transcribes structural RNAs rather than messages.
2. Its products are the 5S rRNA, the transfer RNA precursors and the small nuclear RNAs.
3. Those small nuclear RNAs go on to splice pre-mRNAs and to regulate transcription factors.
4. Every rRNA other than the 5S is made by RNA polymerase I, so that option belongs to the first enzyme.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.3 Eukaryotic Transcription_
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