How Is Glucose Involved in the Catabolite Repression of the Lactose

question 27

Multiple Choice

How is glucose involved in the catabolite repression of the lactose operon?

• A)It has nothing to do with regulation of the lactose operon.
• B)It results in decreased cAMP levels, which in turn leads to decreased CRP binding; thus the lac operon is repressed even if lactose is present along with the glucose.
• C)It is also a substrate for \(\beta\)-galactosidase and thus competes with lactose for this enzyme.
• D)Its presence in the cell increases the amount of lac repressor in the cell.

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