Which of the following is not part of the lac operon?

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Multiple Choice

Which of the following is not part of the lac operon?

Explanation:
The lac operon includes three structural genes that encode the enzymes needed to metabolize lactose: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside transacetylase), along with promoter and operator regions that regulate their transcription. The gene that encodes the lac repressor, lacI, is not part of the operon itself; it sits nearby and produces a regulatory protein that can bind the operator to block transcription when lactose is absent. In the presence of lactose, the repressor is inactivated, allowing transcription. So lacI is not part of the lac operon, while lacZ, lacY, and lacA are.

The lac operon includes three structural genes that encode the enzymes needed to metabolize lactose: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside transacetylase), along with promoter and operator regions that regulate their transcription. The gene that encodes the lac repressor, lacI, is not part of the operon itself; it sits nearby and produces a regulatory protein that can bind the operator to block transcription when lactose is absent. In the presence of lactose, the repressor is inactivated, allowing transcription. So lacI is not part of the lac operon, while lacZ, lacY, and lacA are.

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