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What is true about Bt toxin?...

What is true about Bt toxin?

A

Bt protein exists as active toxin in the Bacillus

B

The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication

C

The concerned Bacillus has antitoxins

D

The inactive protoxin gets converted into active form in the insect gut.

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The correct Answer is:
D
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Read the following and answer questions from Q.1. to Q.5. given below: Plants having foreign genes in their genome through genetic engineering are called transgenic plants. Genes can be incorporated either through a vector or through direct introduction of DNA. Bt cotton is a genetically modified organism which is pestresistant. It contains gene cry I Ac and cry II Ab of Bacillus thuringiensis. It is used to control lepidopterans, coleopterans and dipterans. Bt cotton can resist cotton bollworm and produce higher yields. Cry gene produces cry protein or Bt toxin. It is an endotoxin which remains as protoxin in plants and converted to active toxin after getting ingested by the insects. Alkaline pH of the insect gut solubilizes the protein crystals, the activated toxin creates pores to the mid guts wall of theinsects which cause them to death. What is true about Bt cotton crops?

AAKASH INSTITUTE-BIOTECHNOLOGY AND ITS APPLICATIONS-ASSIGNMENT (SECTION - C) (PREVIOUS YEARS QUESTIONS)
  1. Which one of the following is now being commercially produced by biote...

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  2. Polyethylene glycol method is used for

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  3. What is true about Bt toxin?

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  4. Transgenic plants are the ones:

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  5. The bacterium Bacillus thuringiensis is widely used in contemporary bi...

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  6. Which one of the following is commonly used in transfer of foreign DNA...

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  7. The genetic defect-adenosine deaminase (ADA) deficiency may be cured p...

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  8. A transgenic food crop which may help in solving the problem of night...

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  9. Cry 1 endotoxins obtained from Bacillus Thuringiensis are effective ag...

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  10. what is antisense technology

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  11. Main objective of production of herbicide resistant GM crops is to

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  12. Genetically engineered microorganism used successfully in bioremediati...

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  13. Golden rice is a promising transgenic crop. When released for cultivat...

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  14. Protein products of Bt genes cry IAc and cry II Ab control

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  15. Bacillus thuringiensis (Bt) strains have been used for designing novel

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  16. How is Bt toxin known to kill the target insects in protection of cott...

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  17. Which gene isolated from Bacillus thuringiensis has been known to cont...

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  18. Which of the following statements about Bacillus thuringiensis are cor...

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  19. Crystals of Bt toxin produced by some bacteria do not kill the bacteri...

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  20. Which of the following is used as a bioweapon ?

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