MEDIUM
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Identify the incorrectly matched pair.

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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.
EASY
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.
EASY
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
MEDIUM
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?
EASY
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.
EASY
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 ii Permease
c a gene iii Repressor
d  y gene iv  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?