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What causes the inactive form of Bt toxi...

What causes the inactive form of Bt toxin i.e., protoxin to get converted into its active form in the body of an insect ?

A

Temperature of the gut

B

Enzymes present in the saliva

C

Alkaline pH of the gut

D

There is no specific reason

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The correct Answer is:
C
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The inactive protoxin is activated in the gut of the insect by :

Consider the following statements. A. Bt toxin is produced by a bacterium called Bacillus thuringiensis. B. The Bt toxin is coded by a gene named cry. C. Bt inactive toxin is converted into an active form of toxin due to the acidic pH of the insect gut. D. The Bt proteins encoded by the genes cryIAc and cryIIAb control the corn borer. Of the above statements:

(A) : The Bt toxin proteins exist as inactive protoxins. (R) : It is converted into an active form of toxin by the acidic pH of the gut of the insect.

I. Recombinant DNA technolgy is used to improve crop plants by increasing their productivity, by making them more nutritious and by developing disease resistant II Bt cotton is resistance to bollworm infestation III. Bacillus thuringiensis is not harmed by self cry protein because of its occurrence as protoxin (inactive) V. Protoxin Cry protein is changed into active cry protein in the stomach of insects due to alkaline pH in stomach

In Bt cotton the Bt toxin present in plant tissue as protoxin is converted in to active toxin due to

NCERT FINGERTIPS-BIOTECHNOLOGY AND ITS APPLICATION-Biotechnology And Its Application
  1. Bt toxins are

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  2. Bt toxin protein crystals present in bacterium Bacillus thuringiensis,...

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  3. What causes the inactive form of Bt toxin i.e., protoxin to get conver...

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  4. Bt toxin kills insects by

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  5. The Bt toxin is not human beings because

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  6. Which of the following genes were introduced in cotton to protect it f...

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  7. CryllAb and crylAb produce toxins that control

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  8. Bt corn been made resistant from corn borer disease by intoduction of ...

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  9. Some of the characteristics of Bt cotton are

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  10. The process of RNA interference has been used to make tobacco plant re...

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  11. Which of the following is the nematode that attacks the roots of tobac...

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  12. RNA interference involves

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  13. Which of the following statements are correct regarding the process of...

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  14. The transgenic plant 'Flavr Savr' tomato carries an artificial for

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  15. Flavr Savr' variety of tomato which remains fresh for a longer period ...

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  16. Read the given statements and select the correct option Statement 1 ...

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  17. Hirudin is

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  18. Study the following statements and select the incorrect ones. (i) 'B...

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  19. Nif' gene for nitrogen fixation in cereal crops like wheat jowar etc.,...

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  20. How many recombinant therapeutics worldwide have been approved for hum...

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