In the regulation of the lac operon in Escherichia coli, allolactose
A) is one of the products of lactose metabolism by the cell.
B) has an allosteric interaction with the repressor protein, which makes the repressor protein unable to bind to the operator region.
C) results in an increased rate of transcription of the lacZ, lacY and lacA genes.
D) All of the answers are correct.
E) None of the answers are correct.

Question

Quizplus · Accepted Answer

Allolactose, a product of lactose metabolism, acts as an inducer by binding to the lac repressor, causing an allosteric change that prevents the repressor from binding to the operator. This allows transcription of the lac operon genes (lacZ, lacY, lacA) to proceed, increasing their transcription rate.

In the Regulation of the Lac Operon in Escherichia Coli