Allolactose, an Isomer of Lactose, Is Formed in Small Amounts

Multiple Choice

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 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.