Question

what do you understand by operon concept explain the lac opron the help of diagram​

Answer 1

Explanation:

The lactose or lac operon of Escherichia coli is a cluster of three structural genes encoding proteins involved in lactose metabolism and the sites on the DNA involved in the regulation of the operon. It was Jacob and Monod in 1961 who proposed the operon model for the regulation of transcription.

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Answer 2

Explanation:

Lac opron

In the absence of inducer lactose, the regulator gene R produces a repressor protein which binds to the operator site and prevents transcription of structural genes.

When inducer lactose is introduced in the medium, it binds to the repressor and prevents it from binding to the operator. The operator then induces the RNA polymerase to bind to the promoter and transcribe structural genes to form the mRNA from which the enzymes are formed.