lac operon: synthesizes proteins for the metabolism of lactose (lac genes)
• when lactose and glucose are present, lac genes are not expressed
• when only lactose is present, lac genes are expressed
What would be the effect of a mutation in the lacI gene that prevented the repressor from binding to lactose?
A. The lac Z, Y, and A genes would not be expressed.
B. The lac Z, Y, and A genes would be expressed constitutively
C. The lac Z, Y, and A genes would be repressed by lactose.
D. The lac Z, Y, and A genes would be induced by lactose.
E. The lac Z and Y genes would be repressed but not the lac A gene.
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