Biology · Molecular Genetics

Which one of the following statements regarding the lac operon in Escherichia coli is INCORRECT?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1In the presence of lactose, the repressor cannot bind to the operator.
2The lac operon is highly expressed only when lactose is present and glucose is absent.
3The lac operon is highly expressed only when both lactose and glucose are absent.✓
4The lac operon is controlled by both the Lac repressor and the activator protein, CAP.

Correct answer

The lac operon is highly expressed only when both lactose and glucose are absent.

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