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Question

What is the role of RNA polymerase III in the process of transcription in eukaryotes?

A
Transcribes only snRNAs
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B
Transcribes rRNAs (28S, 18S and 5.8S)
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C
Transcribes tRNAs, 5s rRNA and snRNA
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D
Transcribes precursor of mRNA
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Solution

The correct option is C Transcribes tRNAs, 5s rRNA and snRNA
The process by which genetic information is copied from one strand of the DNA into RNA is termed as transcription. It is catalysed by enzymes known as RNA polymerases. There are three types of RNA polymerases in eukaryotes that transcribe different types of RNAs. They are as follows,
1. RNA polymerase I - It transcribes ribosomal RNAs (28S, 18S, and 5.8S)
2. RNA polymerase II - It transcribes heterogenous nuclear RNA (hnRNA) which is the precursor of messenger RNA (mRNA)
3. RNA polymerase III - It transcribes transfer RNA (tRNA), 5S ribosomal RNA (rRNA), and small nuclear RNA (snRNA)

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