In E.coli the conversion off lactose in galactose and glucose takes place by

1. Beta-galactokinase

2. Beta-guluctosidase

3. Beta-galactosidase

4. Beta-lactosidase

Subtopic:  Gene Regulation: Lac Operon |
 94%
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The conditions which regulate the expression of genes are

1. Environmental

2. Physiological

3. Metabolic

4. All of the above

Subtopic:  Gene Regulation: Introduction |
 94%
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The development and differentiation of embryo into adult organisms are result of

1. chemical regulation of expression of several sets of genes

2. Electrical and Chemical regulation of expression of several sets of genes

3. coordinated regulation of expression of several sets of genes

4. All of above

Subtopic:  Gene Regulation in Eukaryotes |
 51%
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Regulation of gene expression in prokaryotes predominantly takes place at

1. transcriptional

2. translational level

3. splicing gene

4. transportation of m-RNA from cytoplasm to mesosomes

Subtopic:  Gene Regulation: Introduction |
 74%
From NCERT
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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 |
 74%
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Promoter regions of lac operon can be regulated by

1. operator region only

2. structural region

3. both operator and structural region

4. operator , structural and promoter region

Subtopic:  Gene Regulation: Lac Operon |
 59%
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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 |
 92%
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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 |
 67%
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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%
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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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