For the lac operon in E. coli, under conditions in which glucose is absent and lactose is present, which of the following is true?
a. CRP and cAMP together are bound to the DNA, and LacI is bound to the operator site.
b. The lac operon is not transcribed because lactose is present.
c. CRP and cAMP together are bound to the DNA, and allolactose is bound to LacI.
d. The lac operon is not transcribed due to catabolite repression because glucose is absent.
Answer: C
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