In the lactose operon,which of the following is a protein
A)Repressor
B)Operator
C)Regulator
D)Promoter

Question

Quizplus · Accepted Answer

The lactose operon is a genetic system in bacteria that regulates the expression of genes necessary for the utilization of lactose as a carbon source. The system includes a regulator gene, a promoter, an operator, and three structural genes. Among them, the repressor is a protein that binds to the operator and prevents RNA polymerase from transcribing the structural genes in the absence of lactose. When lactose is present, it binds to the repressor and changes its conformation, releasing it from the operator and allowing RNA polymerase to initiate transcription. Therefore, the repressor is a key protein in the lactose operon that controls gene expression.

In the Lactose Operon,which of the Following Is a Protein