A lac ^I−mutant would A)express lacZYA constitutively. B)not induce lacZYA in the presence of lactose. C)not have β-galactosidase activity. D)not transport lactose into the cell effectively. E)not metabolize lactose.

Question

Quizplus · Accepted Answer

The lac ^I− mutation indicates a defective lac repressor (I−), meaning it cannot bind to the operator and repress the lac operon. Thus, lacZYA genes are expressed constitutively, regardless of lactose presence.

A Lac I− mutant Would

A Lac ^I−mutant Would