Question

The removal of which enzyme affects the synthesis of hnRNA in eukaryotes

• A. RNA polymerase II
• B. RNA primase
• C. RNA polymerase III
• D. RNA polymerase I

Answer 1

The correct option is A RNA polymerase II

hnRNA is the precursor of mRNA. It is the primary transcript transcribed by RNA polymerase II in eukaryotes. It contains exons as well as introns, which needs to be spliced out. hnRNA undergoes processing to produce mature mRNA.

RNA polymerase I (Pol I) synthesizes only one type of RNA transcript called pre-ribosomal RNA (or pre-rRNA), which serves as a precursor for the 18S, 5.8S, and 28S rRNAs.

RNA polymerase III (Pol III) synthesizes tRNAs, the 5S rRNA, and some other small specialized RNAs.