Question

Processivity of RNA polymerase is ________

(a) Very high

(b) High

(c) Low

(d) Very low

I had been asked this question in an online interview.

This key question is from Transcription in Prokaryotes : Elongation in section Gene Expression : Transcription Prokaryotes of Cytogenetics

Answer 1

The correct answer is (a) Very high

For explanation I would say: RNA polymerase is highly processive as when the sigma subunit dissociates the DNA binding arm of RNA polymerase clamps shut around the DNA prevents it from falling off. DNA polymerase I on the other hand has low processivity.