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Unformatted text preview: Below: Allolactose, an isomer of lactose, binds with the repressor protein inactivating it. The repressor protein is produced by a regulator gene . The region of DNA where the repressor protein binds is the operator site. The promoter site is a region of DNA where RNA polymerase can bind. The entire unit (promoter, operator, and genes) is an operon . The operator acts like a switch that can turn several genes on or off at the same time. The lac operon is an example of an inducible operon because the structural genes are normally inactive. They are activated when lactose is present....
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