(a) Explain the role of regulatory gene,...

(a) Explain the role of regulatory gene, operator and structural genes in lac operon when E. Coli is growing in a culture medium with the sources of energy as lactose.

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See Q.29, Set-III., Delhi Board (Compatt.)-2011.

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The sequence of genes in lac operon in E. coli is :

structural genes `rarr` operator gene `rarr` promoter gene

promoter gene `rarr` operator gene `rarr` structural gene

structural genes `rarr` promoter gene `rarr` operator gene

operator gene `rarr` promoter gene `rarr` structural gene

Lac A, Lac Y, Lac Z

Lac A , Lac Z, Lac Y

Lac Y, Lac Z, Lac A

Lac Z , Lac Y, Lac A

y, z, a

z, y, a

a, y, z

a, z, y