Question

Which of the following statements are correct?

(i) RNA polymerase I transcribes rRNAs.

(ii) RNA polymerase I transcribes snRNAs.

(iii) RNA polymerase III transcribes snRNA.

(iv) RNA polymerase II transcribes hnRNA.

• A. (i) and (ii)
• B. (i)
• C. (i), (iii) and (iv)
• D. (ii) and (iii)
• E. (i) and (iv)

Answer 1

The correct option is C (i), (iii) and (iv)

Transcription is the first step in decoding a cell's genetic information and begins with the binding of the RNA polymerase complex to a special DNA sequence at the beginning of the gene known as the promoter. In eukaryotes, transcription is achieved by three different types of RNA polymerase ( RNA Pol I, II, III). The polymerases differ in the number and type of subunits they contain, as well as the class of RNAs they transcribe. RNA polymerase I transcribe ribosomal RNAs (rRNAs), RNA polymerase II transcribes mRNAs and also small regulatory RNAs, and RNA polymerase III transcribes small RNAs such as transfer RNAs (tRNAs). Thus, the correct answer is option C.