What do you predict would happen if you replace the Lac operator DNA from the Lac operon with the DNA from the operator region from the tryptophan operon?

Question

Quizplus · Accepted Answer

The operator region of the tryptophan operon is a binding site for the Trp repressor protein. When tryptophan levels are high, the Trp repressor binds to the operator and prevents transcription of the operon. If this same DNA sequence were placed in the Lac operon, the Lac repressor protein would not bind to the operator in the presence of lactose, as it normally would, and the absence of the Lac repressor would not prevent transcription of the operon. However, if tryptophan levels were high, the Trp repressor would bind to the Lac operon operator and prevent its transcription. Therefore, replacing the Lac operator DNA with the operator from the tryptophan operon would result in the Lac operon not being transcribed when tryptophan levels are high.

What Do You Predict Would Happen If You Replace the Lac