Transcriptional Activation of the Lac Operon Requires Both High Lactose

question 81

Multiple Choice

Transcriptional activation of the lac operon requires both high lactose and low glucose conditions because:

• A) RNA polymerase requires CAP in order to bind to the lac operon promoter, even in the absence of the repressor.
• B) glucose normally activates the lac operon repressor.
• C) RNA polymerase is inactive in the presence of high glucose concentrations.
• D) high glucose concentrations stimulate CAP activity.
• E) glucose and lactose compete for binding to, and inactivation of, the lac operon repressor.

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