Question

The lac operon in E. coli controls the gene expression of the enzymes that digest lactose in the cell. In the presence of lactose, the lac operon will turn on and the genes will be expressed. Place the events of gene regulation by the lac operon in order of their occurrence, from the introduction of lactose to the environment to when the cell begins to digest lactose.
A. The repressor is removed from the operator
B. RNA polymerase binds to the promotor region
C. Lactose enzymes genes are expressed by the operon
D. The regulatory gene expresses the repressor protein
E. The repressor is inactivated by lactose

Answer 1

Answer is b,a,d,c,e

Explanation

The Lac Operon is called lactose operon is a cluster of genes with a promoter. The bacteria uses lactose as the source of energy by the proteins coded by genes. This is present in Prokaryotes.

The regulatory gene codes for repressor protein. The repressor binds to lactose and prevent its binding to operator. Thus,RNA polymerase is prevented from binding the promotor. The transcription of genes inhibited . That means correct order is b a d c e