QUESTION 9 In E. coli, an isomer of lactose binds with the lactose operon: O rep

Question

QUESTION 9 In E. coli, an isomer of lactose binds with the lactose operon: O repressor, preventing it from binding to the operator. This allows the lacZ and lacY genes to be transcribed O operator, preventing it from binding to the repressor. This allows the locZ and lacY genes to be transcribed O repressor, helping it bind to the operator. This prevents the lacZ and lacY genes from being transcribed O operator, preventing RNA polymerase from being recruited. This prevents the lacZ and lacY genes trom being transcribed O operator, recruiting RNA polymerase. This allows the lacZ and lacY genes to be transcribed.

Explanation / Answer

Actually, lactose itself is not an inducer, but allolactose is. Allolactose is an isomer of lactose. When isomer of lactose is present, it binds to the repressor and inactivates it. This allows transcription. In E. coli, the-galactosidase converts lactose into allolactose that binds to repressor protein and inactivate it, so that transcription of structural gene occur.

Ans a. repressor, preventing it from binding to the operator. This allows the lac Z and lac Y genes to be transcribed.

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