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Which part of sigma factor associates with -10box?

(a) 1.2

(b) 2.4

(c) 4.4

(d) 4.2

I got this question in final exam.

Asked question is from Transcription in Prokaryotes : Initiation in division Gene Expression : Transcription Prokaryotes of Cytogenetics

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Correct answer is (b) 2.4

Easiest explanation: the 2.4 i.e. (4^th part of 2^nd subunit) associates with the -10box in promoter. While 4.2 associates with -35box of the promoter. 1.2 sub unit doesn’t associate with DNA; and there is no 4.4 unit in sigma factor.

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