Allolactose,an isomer of lactose,is formed in small amounts from lactose.An E.coli cell is presented for the first time with the sugar lactose (containing allolactose)as a potential food source.Which of the following processes occurs when the lactose enters the cell?
A)The repressor protein attaches to the regulator.
B)Allolactose binds to the repressor protein.
C)Allolactose binds to the operator.
D)The repressor protein and allolactose bind to RNA polymerase.
E)Allolactose binds to the inducer.

Question

Quizplus · Accepted Answer

Allolactose binds to the repressor protein, causing a conformational change that prevents the repressor from binding to the operator region of the lac operon. This allows RNA polymerase to transcribe the genes involved in lactose metabolism, leading to the utilization of lactose as a food source.

Allolactose,an Isomer of Lactose,is Formed in Small Amounts from Lactose