Question

What is synthesized by RNA polymerase II?

• A. rRNA sequence
• B. Prokaryotic rRNA
• C. Eukaryotic mRNA
• D. Prokaryotic tRNA

Answer 1

Answer: (C)

Eukaryotic 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 II (Pol II) catalyzes the synthesis of mRNAs and some specialized RNAs. RNA polymerase III (Pol III) synthesizes tRNAs, the 5S rRNA, and some other small specialized RNAs. Prokaryotes have a single type of RNA polymerase that synthesizes all the three types of RNAs (tRNA, rRNA and mRNA). Option C is correct.