Practice question

MCQ

Question

Which of the following is correct about a repressible operon?

Options

Choose one · Correct answer highlighted

It is always active, regardless of environmental conditions. It is normally on but can be turned off by a repressor. Correct It is permanently inactive. It requires an inducer for activation.

Explanation

A **repressible operon, such as the trp operon, is normally on but can be turned off when a repressor binds to it**. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

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