Chapter: Molecular Basis of Inheritance· Biology

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

Q.1 (ii) Which one of the following is not a part of lac operon?

A. Promoter

B. Regulator

C. Inducer

D. Operator

Doubtly Asked 29 Oct 2026 Board exam · March 2024 hsc 12th Save WhatsApp Report

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Answer: (c) Inducer

The lac operon consists of the regulator gene (i), promoter, operator and the structural genes z, y and a. The inducer (lactose / allolactose) is a substrate molecule that comes from outside; it binds the repressor and switches the operon on, but it is not a part of the operon.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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

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