Promoter regions of lac operon can be accessed by

(1)RNA polymerase

(2)DNA polymerase

(3)Proteins

(4)All of these

Subtopic:  Gene Regulation: Lac Operon |
 71%
From NCERT
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The lac in lac operon refers to

(1)lactose but not lactase

(2)lactase but not lactose

(3)lactobacillus but not lactose

(4)lactose as well as laevorotatory

Subtopic:  Gene Regulation: Lac Operon |
 90%
From NCERT
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The i-gene in lac operon refers to

(1)inducer

(2)inhibitor

(3)sometimes inducer sometimes inhibitor

(4)neither inducer nor inhibitor

Subtopic:  Gene Regulation: Lac Operon |
 68%
From NCERT
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For lactose metabolism

(1) all three gene products are required

(2) only regulator gene products are required

(3) only Beta-galactosidase are required

(4) Beta-galactosidase and permease are required

Subtopic:  Gene Regulation: Lac Operon |
 79%
From NCERT
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In lac operon, repressor is inactivated by

(1)interaction with enzyme

(2)interaction with protein

(3)interaction with carbohydrate

(4)interaction with nucleic acid

Subtopic:  Gene Regulation: Lac Operon |
 61%
From NCERT
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How long the lac operon would be expressed in the presence of lactose?

(1) When glucose is more than lactose concentration

(2) As long as lactose is more than galactose concentration

(3) As long as lactose is more than glucose concentration

(4) when lactose equals glucose concentration

Subtopic:  Gene Regulation: Lac Operon |
 60%
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Lac operon is an example of

(1) both positive and negative regulation

(2)only negative regulation

(3)only positive regulation

(4)sometimes positive sometimes negative

Subtopic:  Gene Regulation: Lac Operon |
 63%
From NCERT
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Lac operon inhibition by repressor is an example of

(1) negative regulation

(2)positive regulation

(3)neither positive nor negative

(4) both positive and negative regulation

Subtopic:  Gene Regulation: Lac Operon |
 86%
From NCERT
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Regulation of lac operon can be visualised as regulation of enzyme synthesis by its

(1) substrate

(2)lactose

(3)carbohydrates

(4)All of these

Subtopic:  Gene Regulation: Lac Operon |
 56%
From NCERT
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Lac operon will be switched on when

(1) lactose is less in the medium

(2)glucose is enough in the medium

(3)lactose is less than glucose

(4)lactose is more than glucose

Subtopic:  Gene Regulation: Lac Operon |
 77%
From NCERT
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