A mutation in the lac A gene would result in
A) continuous production of the proteins encoded by the three structural genes
B) continuous production of the lac repressor
C) normal operation of the lac operon, but with an alteration in the proteins encoded by the lac A gene
D) no transcription from the lac operon

Question

Quizplus · Accepted Answer

The lac A gene encodes the enzyme thiogalactoside transacetylase, which is part of the lac operon but not essential for lactose metabolism. A mutation in lac A would affect the function or structure of the enzyme it encodes but would not impact the regulation or operation of the lac operon itself.

A Mutation in the Lac a Gene Would Result in