Which of the following combinations will produce the highest expression of β-galactosidase?

Question

Quizplus · Accepted Answer

The presence of lactose will induce the lac operon, and the presence of the lacI gene with the ^{promoter will ensure high levels of expression of β-galactosidase. The presence of an additional copy of the promoter on the plasmid will further enhance expression. The absence of the} promoter and the absence of lactose will prevent any potential repression of the lac operon.

Which of the Following Combinations Will Produce the Highest Expression