NCERT Solutions for Class 12 Biology Chapter 12

Biotechnology and its Applications Class 12

Chapter 12 Biotechnology and its Applications Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 215

Q1 :  

Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because -

(a) bacteria are resistant to the toxin

(b) toxin is immature:

(c) toxin is inactive:

(d) bacteria encloses toxin in a special sac.


Answer :

toxin is inactive:

In bacteria, the toxin is present in an inactive form, called prototoxin, which gets converted into active form when it enters the body of an insect.

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Q2 :  

What are transgenic bacteria? Illustrate using any one example.


Answer :

Transgenic bacteria contain foreign gene that is intentionally introduced into its genome. They are manipulated to express the desirable gene for the production of various commercially important products.

An example of transgenic bacteria is E.coli. In the plasmid of E.coli, the two DNA sequences corresponding to A and B chain of human insulin are inserted, so as to produce the respective human insulin chains. Hence, after the insertion of insulin gene into the bacterium, it becomes transgenic and starts producing chains of human insulin. Later on, these chains are extracted from E.coli and combined to form human insulin.

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Q3 :  

Compare and contrast the advantages and disadvantages of production of genetically modified crops.


Answer :

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Q4 :  

What are Cry proteins? Name an organism that produces it. How has man exploited this protein to his benefit?


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Q5 :  

What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency.


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Q6 :  

Diagrammatically represent the experimental steps in cloning and expressing an human gene (say the gene for growth hormone) into a bacterium like E. coli ?


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Q7 :  

Can you suggest a method to remove oil (hydrocarbon) from seeds based on your understanding of rDNA technology and chemistry of oil?


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Q8 :  

Find out from internet what is golden rice.


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Q9 :  

Does our blood have proteases and nucleases?


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Q10 :  

Does our blood have proteases and nucleases?


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<< Previous Chapter 11 : Biotechnology : Principles and Processes Next Chapter 13 : Organisms and Populations >>

Biology : CBSE NCERT Exercise Solutions for Class 12th for Biotechnology and its Applications will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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