What is Unique About the RNA Polymerase Encoded by the Bacteriophage

Question

What is unique about the RNA polymerase encoded by the bacteriophage T7?
A) It depends on host cell proteins for its function.
B) It is composed of a single polypeptide.
C) It is composed of many polypeptides.
D) It can transcribe host genes in addition to viral genes.
E) It can only transcribe the Class I genes on the T7 genome.

Accepted Answer

The RNA polymerase encoded by the bacteriophage T7 is composed of a single polypeptide, which is unique compared to other RNA polymerases that are typically multimeric.