Which of the following is not a function of the repressor?

Blocks passage of RNA polymerase towards structural enzyme.

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Has two allosteric sites.

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Changes the shape of the operator binding site.

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None of these.

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Solution

The correct option is D None of these.
Repressor is a small protein formed by the regulator gene which binds to the operator gene and blocks passage of RNA polymerase towards structural enzyme. It has two allosteric sites- to attach to operator gene and to bind to inducer. The inducer changes the shape of the operator binding site so that the repressor remains attached to the operator.

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Column-I	Column-II
(A) Structural gene	(i) Binding site for a repressor protein
(B) Operator gene	(ii) Codes for a repressor protein
(C) Promoter gene	(iii) Induce lactose transport from the medium
(D) Regulator gene	(iv) Codes for protein enzyme
	(v) Binding site for RNA polymerase

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