Question

fill in the blank question

an inactive repressor binds to a(n) ______ to make an active repressor.

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Explanation:

Identify the mechanism of repressible operons

In repressible gene regulation systems (such as the tryptophan operon), the repressor protein is synthesized in an inactive form (an aporepressor) that cannot bind to the operator on its own.

Determine the binding molecule

An external small molecule, known as a corepressor, must bind to the inactive repressor. This binding event induces a conformational change that activates the repressor, allowing it to bind to the operator and block transcription.

Answer:

An inactive repressor binds to a(n) <blank>corepressor</blank> to make an active repressor.