Which of the following describes the Lac operon in E. coli when lactose, but not glucose, is present in the culture medium?
A. CAP and the Lac repressor are both bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed.
B. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed.
C. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed.
D. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed.
E. The Lac repressor, but not CAP, is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed.
Ans: D. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed.
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