Assertion :The predominant site for control of gene expression in prokaryotes is transcription initiation. Reason: The activity of RNA polymerase is regulated by accessory proteins, which affect recognition of start sites.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In prokaryotes, control of the rate of transcriptional initiation is the predominant site for control of gene expression. In a transcription unit, the activity of RNA polymerase at a given promoter is in turn regulated by interaction with accessory proteins, which affect its ability to recognise start sites. These regulatory proteins can act both positively (activators) and negatively (repressors).
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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