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In E.coli, the lac operon gets switched on when:
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Lactose is present and it binds to the repressor
Lac operon consists of :
Promotor site - It is the site for the attachment of RNA polymerase enzyme.
One regulatory gene - i (i indicating inhibitor, not inducer). It synthesizes the active repressor protein all the time.
Operator (lac operator) - Active repressor protein synthesized by the regulatory gene is attached to the operator and the transcription by RNA polymerase enzyme.
Three structural genes (z gene, y gene and a gene).
Promotor site - It is the site for the attachment of RNA polymerase enzyme.
One regulatory gene - i (i indicating inhibitor, not inducer). It synthesizes the active repressor protein all the time.
Operator (lac operator) - Active repressor protein synthesized by the regulatory gene is attached to the operator and the transcription by RNA polymerase enzyme.
Three structural genes (z gene, y gene and a gene).
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