Gene regulation governing lactose operon of E.coli that involves the lac-I gene products is?

Q. the statements regarding the lac operon and choose the correct option.
1. An inducer regulates the switching on and off of lac operon. 2. Repressor protein dissociates from the operator region and prevents RNA polymerase from transcribing the operon.
3. In the presencRead e of lactose, the repressor is activated by interaction with lactose.
4. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

Q. Gene regulation governing lac operon of E.coli that involves the lac I gene product is:

Q. Match the component of 'lac operon' of E.coli given under column-I with their function listed in column-II. Choose the answer with the correct combination of alphabet of the two columns:

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

Q. E.coli cells with a mutated Z gene of the lac operon can not grow in medium containing only lactose as the source of energy because:

Q. In the Lac operon, the repressor protein exerts a negative effect on the expression of structural genes in the absence of inducer molecule. In case of the Lac operon, what is the inducer molecule?