When lactose is absent, the repressor protein produced by the regulatory gene binds to the operator, blocking RNA polymerase from binding to the promoter and thus preventing transcription of the lac operon genes.
When lactose is absent, the repressor protein produced by the regulatory gene binds to the operator, blocking RNA polymerase from binding to the promoter and thus preventing transcription of the lac operon genes.
| Front | Explain how the lac operon works when lactose is absent from the growth medium. |
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| Back | Lac operon, no lactose:
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