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provide an example of prokaryotic gene that is constitutively expressed.

provide an example of prokaryotic gene that is constitutively expressed.

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LacI gene, which encodes the lac repressor, is constitutively expressed. The lacI gene lies near the lac operon.

Some genes are not subject to regulation, i.e. they are constitutively expressed. Such genes are always transcribed. LacI gene is one such gene. The lac repressor blocks the binding of the RNA polymerase to the promotor. Thereby keeping the operon turned off.

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