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Question

A regulatory gene produces some kind of protein through its mRNA that controls the activity of the operator gene which signals the formation of specific enzymes required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?
  1. The repressor protein produced after combining with an inducer activates the operator gene
  2. The repressor protein produced after combining with a co repressor activates the operator gene
  3. The catabolic activator protein(CAP) produced activates the operator gene
  4. The mutated repressor protein produced activates the operator gene

A
The repressor protein produced after combining with a co repressor activates the operator gene
B
The repressor protein produced after combining with an inducer activates the operator gene
C
The catabolic activator protein(CAP) produced activates the operator gene
D
The mutated repressor protein produced activates the operator gene
Solution
Verified by Toppr

when repressor not able to block operator gene ,operator gene remain functional.active protein produced by regulator gene act on E.coli operon system.so correct option is D

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Similar Questions
Q1
A regulatory gene produces some kind of protein through its mRNA that controls the activity of the operator gene which signals the formation of specific enzymes required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?
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Q2
Assertion :Operator gene is functional when it is not blocked by repressor. Reason: Regulator gene produces active proteins only which acts on operon system in E. coli.
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Q3
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
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Q4
Select the two correct statements out of the four (a to d) given below about lac–operon:
a) Allolactose may bind with repressor and inactivate it.
b) In the absence of lactose, the repressor binds with the operator regions.
c) The z-gene codes for permease.
d) The i-gene codes for activator protein.

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Q5
Considering lac operon, match the following:

Column IColumn IIp.Regulatorgenei.Binding site for repressor proteinq.Operator geneii.Code(s)for the protein of the enzymesr.Promoter geneiii.Code(s) for repressor proteins.Structural genesiv.Binding Site for RNA polymerase


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