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Lac operon consists of

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Important Questions on Molecular Basis of Inheritance

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:
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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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MEDIUM
Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
Select the correct match:
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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
The equivalent of a structural gene is:
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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
Identify the correct arrangement of different genes in Lac operon from the following.
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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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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
Which of the following enzymes is not produced by E.coli during lactose catabolism?
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
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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
Expression of gene regulation results in:
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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
When does the lac-operon in E. coli become "switched on"?
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?
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 ii Permease
c a gene iii Repressor
d  y gene iv  Transacetylase

Select the correct option.
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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
Which one of these substances will repress the lac operon?
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Biology>Genetics and Evolution>Molecular Basis of Inheritance>Operon Concept
All of the following are part of an operon except
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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.
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.
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.
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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
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
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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?