Suppose an E

Suppose an E. coli cell is in an environment that is rich in glucose and poor in lactose. Which statement best explains gene expression of enzymes used in lactose breakdown?

A) A repressor binds to the operator site of the lac operon and inhibits transcription of the genes involved in lactose breakdown.
B) The high levels of glucose cause a cascade that ends with CAP binding to RNA polymerase, which activates transcription of the genes involved in lactose breakdown.
C) Glucose binds to a repressor protein, which binds to the operator site and blocks RNA polymerase from transcribing the genes involved in lactose breakdown.
D) Glucose binds to the operator site of the lac operon, repressing transcription of the genes involved in lactose breakdown.

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