Question

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Answer 1

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• Regulatory gene in this operon is i gene.
• In absence of inducer, the repressor protein binds to the operator region and prevents RNA polymerase from transcribing the structural gene. Thus, the lac operon gene is inactivated. Lac operon in presence of inducer binds with repressor protein and inactivates it. This allows RNA polymerase access to promoter and transcription proceeds.
• Gene ‘z’ cod*e for beta-galactosidase, which is responsible for the hydrolysis of lactose into galactose and glucose.