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 |
 67%
From NCERT
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In lac operon

1. 3 structural, 1 operator and 2 promoter genes are present

2. 3 structural, 1 operator and 1 promoter genes are present

3. 3 structural, 2 operator and 1 promoter genes are present

4. 3 structural, 1 operator and 3 promoter genes are present

Subtopic:  Gene Regulation: Lac Operon |
 71%
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 |
 80%
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 |
 60%
From NCERT
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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 |
 65%
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 |
 92%
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 |
 64%
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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Repressor mRNA will be formed in

1. absence of inducer

2. presence of inducer

3. both A and B

4. presence of lac mRNA

Subtopic:  Gene Regulation: Lac Operon |
From NCERT
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The order and sequence of amino acids are defined by

1. Nucleotides sequences in DNA

2. Nucleotides sequences in mRNA

3. Nucleotides sequences in template strand of DNA

4. Nucleotides sequences in non- template strand of DNA

Subtopic:  Translation |
 64%
From NCERT
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