How Is Glucose Involved in the Catabolite Repression of the Lactose

question 62

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 β-galactosidase and thus competes with lactose for this enzyme.
• D) Its presence in the cell increases the amount of lac repressor in the cell.
• E) It provides energy to the operon.

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