(a) What is an operon ?
(b) Explain how a polycistronic structural gene is regulated by a common promoter and a combination of regulatory genes in a lac- opron.

(a) What is an operon ? (b) Explain how a polycistronic structural gene is regulated by a common promoter and a combination of regulatory genes in a lac- operon.

A polycistronic structural gene of lac operon is regulated by

In operon model, regulator gene

The promoter gene in lac operon :

Enlist the genes in Lac operon

In operon model, regulator gene :

Assertion : In lac operon, a polycistronic structural gene is regulated by a common promoter and regulater. Reason: It is an example of negative cotrol of transcription initiation.

Assertion :- In lac operon, a polycistronic structural gene is regulated by a common promoter & regulatory genes. Reason : Such arrangement is very common in bacteria & is referred as operon.

Assertion :- In lac operon, a polycistronic structural gene is regulated by a common promoter & regulatory genes. Reason : Such arrangement is very common in bacteria & is referred as operon.