Mutation of the repressor protein to an inactive form leads to constitutive (always on) expression of the operon.

Question

Quizplus · Accepted Answer

Both the lac and trp operons can exhibit constitutive expression if the repressor protein is mutated to an inactive form. In the lac operon, this would result in continuous expression of genes involved in lactose metabolism, while in the trp operon, it would lead to unregulated expression of genes involved in tryptophan synthesis.

Mutation of the Repressor Protein to an Inactive Form Leads