What is Predicted to Occur If the Operator is Removed

Question

What is predicted to occur if the operator is removed from the lac operon?
A)The lac operon would be transcribed continuously.
B)Only lacZ would be transcribed.
C)Only lacY would be transcribed.
D)Galactosidase permease would be produced, but would be incapable of transporting lactose.
E)None of the proteins coded by the lac operon would be produced.

Accepted Answer

The operator region regulates the transcription of the lac operon. If the operator is removed, the repressor protein would no longer be able to bind to it and inhibit transcription. As a result, the lac operon would be transcribed continuously, leading to the production of all the proteins coded by the operon, including beta-galactosidase, lactose permease, and transacetylase.