Match the following genes of the Lac operon with their respective products: Column-I Column-II a i gene i ß-galactosidase b z gene i i Permease c a gene i i i Repressor d y gene i v Transacetylase Select the correct option.

a - i i i ; b - i ; c - i v ; d - i i

a - i ; b - i i i ; c - i i ; d - i v

a - i i i ; b - i ; c - i i ; d - i v

a - i i i ; b - i v ; c - i ; d - i i

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The figure describes the structure of the lac operon with the parts A, B, C and D. Identify the option in which these parts are identified correctly.

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Important Questions on Molecular Basis of Inheritance

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Beadle and Tatum used the organism ______ in their experiment with mutagenic agent, giving One gene-One enzyme hypothesis.

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

When Escherichia coli cells are cultured in a medium where Lactose is absent, the 'i' gene of Lac Operon continues to produce repressor mRNA, because it is

MEDIUM

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

When does the lac-operon in E. coli become "switched on"?

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Given the diagram of the lac operon showing an operon of inducible enzymes. Identify components and enzymes ( $A, B, C, D$ and $E$ ) ?

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HARD

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Gene regulation governing lactose operon of E. coli that involves the lac I gene product is:

MEDIUM

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Identify the incorrect phenomenon expressed by a bacterium grown in a medium lacking lactose.
I) Initiates beta-galactosidase activity
II) Bacteria does not produce galactose and glucose
III) Promotor site of transcription unit acts as a repressor

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Identify the correct arrangement of different genes in Lac operon from the following.

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Draw the schematic/diagrammatic presentation of lac operon.

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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

The schematic below describes the states of the lac operon in the absence of lactose. Which ONE of the following happens when lactose is present in the cell?
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EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Which one of these substances will repress the lac operon?

HARD

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

What is gene expression? Write two methods of regulation of gene expression in bacteria.

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

The equivalent of a structural gene is:

MEDIUM

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

What is lac operon? Describe the structure of controller genes and structural genes with diagrams.

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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

In operon the segments of DNA which carry codes for the synthesis of proteins are known as

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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Which of the following is required as an inducer for the expression of lac operon?

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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Explain the regulation of Lac operon in absence and presence of Lactose as an Inducer.

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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Name the inducer which regulates the switching on and off of the lac operon.

MEDIUM

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Match the following genes of the Lac operon with their respective products:

	Column-I		Column-II
$(a)$	i gene	$(i)$	ß-galactosidase
$(b)$	z gene	$(i i)$	Permease
$(c)$	a gene	$(i i i)$	Repressor
$(d)$	y gene	$(i v)$	Transacetylase

Select the correct option.

EASY

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

Which of the following is required as inducer(s) for the expression of Lac operon?

MEDIUM

Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept

In the presence of glucose and lactose, Escherichia coli utilizes glucose. However, lactose also enters the cells because?

The figure describes the structure of the lac operon with the parts A, B, C and D. Identify the option in which these parts are identified correctly.

Important Questions on Molecular Basis of Inheritance

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