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Name the sigma factor which is used for promoter recognition?

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Name the sigma factor which is used for promoter recognition?

(a) Sigma 32

(b) Sigma 70

(c) Sigma 60

(d) Sigma 40

This question was addressed to me in final exam.

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

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The correct answer is (b) Sigma 70

To explain: There are 7 different types of sigma factors have been reported in E. coli but the most common is sigma 70.

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