How Is Glucose Involved in Catabolite Repression of the Lac

question 23

Multiple Choice

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

• A)Glucose causes cAMP levels to increase, which leads to increased CRP binding and the lac operon is activated even when lactose is present.
• B)Glucose causes cAMP levels to decrease, which leads to decreased CRP binding and the lac operon is repressed even when lactose is present.
• C)Glucose is also a substrate for β-galactosidase and thus competes with lactose for this enzyme.
• D)Glucose activates transcription of the lacI gene to increase the amount of Lac repressor in the cell.

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