Topic: Gene regulation: lac operon· Genetics and Evolution

The lactose present in the growth medium of bacteria is transported to the cell by the action of:

1. Polymerase

2. Beta-galactosidase

3. Acetylase

4. Permease

Doubtly Asked 30 Oct 2026 NEET UG 2024 Practice test neet Save WhatsApp Report

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Answer: 4. Permease

Key idea: in the lac operon, permease carries lactose into the cell.

The lac operon has three structural genes: z codes for beta-galactosidase (breaks lactose), y codes for permease (transport of lactose into the cell) and a codes for transacetylase. Polymerase is for transcription.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The lactose present in the growth medium of bacteria is transported to the cell by the action of:

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