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

Question : Assertion : The predominantsite for control ofgene expressi

1.	Question : Assertion : The predominantsite for control ofgene expression in prokaryotes is transcription initiation. Reason : The activity of RNA polymerase is regulated by accessory proteins, which affect recognition of start sites.
Answer» If both ASSERTION and reason are true and reason is the correct explanation of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(a)In prokaryotes, control of the rate of TRANSCRIPTIONAL initiation is the predominant sitefor control of gene EXPRESSION. In a transcription unit, the activityof RNA POLYMERASE at a given promoter , isin turn turn regulatedby interactionwith accessory porteins, Which affect its ability its ability to recognise start SITES. These regulatory proteins can act both positively (activators) and negatively (repressors).