What is the function of the sigma (s) subunit of RNA polymerase in
A) It recognizes promoters where transcription should begin.
B) It contains the active site for synthesis of RNA.
C) It ensures proper processitvity of the polymerase, so it doesn't stop prematurely.
D) It is involved in chain termination.
E) coli?

Question

Quizplus · Accepted Answer

The sigma (s) subunit of RNA polymerase recognizes the promoter sequence in DNA, which signals the start of transcription. The s subunit helps to bind RNA polymerase to DNA at the correct location to begin transcription. Once the polymerase is bound to the promoter, the s subunit dissociates, and the active site for RNA synthesis is created. Therefore, choice A is the best option.

What Is the Function of the Sigma (S) Subunit of RNA