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Which of these genes is not a part of the lac operon?

A. operator gene
B. promoter gene
C. repressor gene

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The lac operon contains an operator, promoter, and structural genes that are transcribed together and are under the control of the catabolite activator protein (CAP) or repressor.The lac operon encodes for the genes needed to utilize lactose as an energy source. Answer is C
User Danh Huynh
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