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Which of the following ensure stable binding of RNA polymerase at the promoter site?

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Which of the following ensure stable binding of RNA polymerase at the promoter site?

(a) DNA photolyase

(b) Sigma factor

(c) DNA glycosylase

(d) RecA

This question was addressed to me in an international level competition.

This question is from Transcription topic in portion Molecular Genetics of Life Sciences

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The correct answer is (b) Sigma factor

To elaborate: Sigma factor decreases the binding of the core enzyme to non-specific DNA sequences and increases binding to the promoter.

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