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DNA Replication

In E. coli, d...

Question

In E. coli, during lactose metabolism, the repressor binds to ________.

A

Regulator gene

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B

Operator gene

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C

Structural gene

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D

Promoter gene

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Solution

The correct option is B Operator gene
In Lac operon in E. coli.

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Q. In E. coli, during lactose metabolism, repressor binds to:

Q. Operon is a coordinated group of genes that function together as a unit for a metabolic pathway. How many statements below are correct with respect to lac operon?
i) Glucose or galactose may bind with the repressor and inactivate it.
ii) In the absence of lactose, the repressor binds with the operator region.
iii) The Z-gene codes for permease.
iv) I- gene codes for repressor protein

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. Which of the following statements are true about lac operon?
I. Glucose binds to CAP binding site and activates the operon
II. In the absence of lactose, the repressor binds with the operator region
III. All three structural gene products are not essential for the metabolism of lactose
IV. The operator is a negative regulatory site bound by the lac repressor protein

In prokaryotes during the process of gene regulation

i. Lactose suppresses gene expression
ii. Tryptophan acts as an inducer for gene expression
iii. Regulator produces the repressor molecule

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