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The upstream sequence where the σ protein binds constitutes the promoter sequence.

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The upstream sequence where the σ protein binds constitutes the promoter sequence.

(a) True

(b) False

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I'd like to ask this question from Promoter and Regulatory Elements in Prokaryotes & Eukaryotes topic in division Promoter and Regulatory Element Prediction of Bioinformatics

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Right answer is (a) True

For explanation: This includes the sequence segments located 35 and 10 base pairs (bp) upstream from the transcription start site. They are also referred to as the −35 and −10 boxes. For the σ70 subunit in Escherichia coli, for example, the −35 box has a consensus sequence of TTGACA. The –10 box has a consensus of TATAAT.

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