If by radiation all nitrogenase enzymes are inactivated, then there will be no

1.  Conversion from nitrate to nitrite in the legumes

2.  Conversion from ammonium to nitrate in soil

3.  Fixation of nitrogen in the legumes

4.  Fixation of atmospheric nitrogen

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4
Correct Answer :

Fixation of atmospheric nitrogen


Explanation :
No Explanation available for this question

10% energy transfer law in food chain was first given by

1.  Lindemann

2.  Tansley

3.  Elton

4.  Raunkiaer

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4
Correct Answer :

Lindemann


Explanation :
No Explanation available for this question

Desert can be converted into green land by planting

1.  Oxylophytes

2.  Psammophytes

3.  Halophytes

4.  Tropical trees

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4
Correct Answer :

Psammophytes


Explanation :
No Explanation available for this question

Which one of the following is a correct food chain

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

Provirus differs from prophage with regard to

1.  Integration of RNA with host DNA

2.  Integration of genetic DNA with host DNA

3.  Integration of copy DNA of retrovirus with host DNA

4.  None of the above

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4
Correct Answer :

Integration of copy DNA of retrovirus with host DNA


Explanation :
No Explanation available for this question

Restriction endonuclease enzymes(RE) also called microscissors are widely used in genetic engineering.They cleave up foreign DNA at specific sites.These enzymes are synthesized by

1.  All cells

2.  Yeast and viruses

3.  Bacteria only

4.  Yeast and bacteria

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4
Correct Answer :

Bacteria only


Explanation :
No Explanation available for this question

There is no masking in expression of genes in Neurospora,because it

1.  Has short life span

2.  Is diploid

3.  Is haploid

4.  All of these

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4
Correct Answer :

Is haploid


Explanation :
No Explanation available for this question

In a lac-operon model,the addition of lactose induces the synthesis of

1.  β- galactosidase

2.  Permease

3.  Transacetylase

4.  All the above

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4
Correct Answer :

All the above


Explanation :
No Explanation available for this question

Two bacteria found to be very useful in genetic engineering experiments are

1.  Nitrosomonas and Klebsiella

2.  Escherichia and Agrobacterium

3.  Nitrobacter and Azotobacter

4.  Rhizobium and Diplococcus

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4
Correct Answer :

Escherichia and Agrobacterium


Explanation :
No Explanation available for this question

When a bacteriophage,in its lytic phage carries some of the bacterium's partially digested chromosome with it to another host cell,the process is called

1.  Transformation

2.  General transduction

3.  Restricted transduction

4.  Conjugation

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4
Correct Answer :

General transduction


Explanation :
No Explanation available for this question
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