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The Lac operon contains three structural genes z'',y' and a'' The structural genes code for
i) The 'z' gene codes for beta-galactosidase enzyme.
ii) 'a' gene does not code for transacetylase enzyme.
iii) The 'y' gene codes for enzyme permease.
iv) 'y'' gene does not code for the enzyme permease.
v) 'a' gene codes a transacetylase enzyme.
The correct combination is

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Important Questions on Molecular Basis of Inheritance

HARD
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Gene regulation governing lactose operon of E. coli that involves the lac I gene product is:
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression

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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Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Select the correct match:
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
The equivalent of a structural gene is:
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Identify the correct arrangement of different genes in Lac operon from the following.
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
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>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Which of the following enzymes is not produced by E.coli during lactose catabolism?
MEDIUM
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
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>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Expression of gene regulation results in:
MEDIUM
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
When does the lac-operon in E. coli become "switched on"?
MEDIUM
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
In the presence of glucose and lactose, Escherichia coli utilizes glucose. However, lactose also enters the cells because?
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Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
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>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Which one of these substances will repress the lac operon?
MEDIUM
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
All of the following are part of an operon except
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Beadle and Tatum used the organism ______ in their experiment with mutagenic agent, giving One gene-One enzyme hypothesis.
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Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
What is lac operon? Describe the structure of controller genes and structural genes with diagrams.
HARD
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
What is gene expression? Write two methods of regulation of gene expression in bacteria.
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
In operon the segments of DNA which carry codes for the synthesis of proteins are known as
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
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
EASY
Biology>Molecular Biology>Molecular Basis of Inheritance>Regulation of Gene Expression
Which of the following is required as inducer(s) for the expression of Lac operon?