What would occur if the repressor of an inducible operon...

What would occur if the repressor of an inducible operon were mutated so it could not bind the operator? \begin{equation} \begin{array}{l}{\text { (A) irreversible binding of the repressor to the promoter }} \\ {\text { (B) reduced transcription of the operon's genes }} \\ {\text { (C) buildup of a substrate for the pathway controlled by the }} \\ {\text { operon }} \\ {\text { (D) continuous transcription of the operon's genes }}\end{array} \end{equation}

What would occur if the repressor of an inducible operon were
mutated so it could not bind the operator?
\begin{equation}
\begin{array}{l}{\text { (A) irreversible binding of the repressor to the promoter }} \\ {\text { (B) reduced transcription of the operon's genes }} \\ {\text { (C) buildup of a substrate for the pathway controlled by the }} \\ {\text { operon }} \\ {\text { (D) continuous transcription of the operon's genes }}\end{array}
\end{equation}

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Key Concepts

Repressor Protein

A repressor is a regulatory protein that binds to the operator sequence of an operon in order to block the transcription of its genes. Its binding prevents RNA polymerase from transcribing the operon unless an inducer inactivates the repressor.

Operator Region

The operator is a segment of DNA situated near and often within the promoter of an operon. It serves as the binding site for the repressor, thereby controlling the accessibility of the operon's genes to the transcriptional machinery.

Inducible Operon

An inducible operon is a set of genes that is usually turned off but becomes activated in the presence of a specific inducer. This regulatory mechanism allows cells to conserve resources by only expressing genes when the gene product is needed.

Mutation Affecting DNA-Protein Interactions

Mutations that impair the ability of a repressor to bind to the operator disrupt the regulatory mechanism of the operon. Without binding, the repressor cannot inhibit transcription, leading to continuous, unregulated expression of the operon's genes (constitutive expression).

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