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Nutrient environment and its effect on the Lac operon.

What would be the effect on lac operon expression in the following media that contains a strain of E.Coli? What if this mutant also contained an O^- mutation?
a. Glucose
b. Lactose
c. Glucose + Lactose

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It's important to understand how the lac operon is structured, and why beta-galactosidase is produced when lactose is present, and production is stopped when there is no more lactose left.

The lac operon produced three genes, one of them being beta-galactosidase, which breaks down lactose into galactose and glucose. When ...