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What is true about Bt toxin?...

What is true about Bt toxin?

A

The concerned Bacillus has antitoxins

B

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

C

Bt protein exists as active toxin in the Bacillus

D

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

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The correct Answer is:
B
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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?

MOTION-BIOTECHNOLOGY : PRINCIPLES AND PROCESSES-EXERCISE -3
  1. Transgenic plants are the ones

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

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  3. What is true about Bt toxin?

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

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  5. Which one of the following is used as vector for cloning genes into hi...

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  6. Restriction endonucleases are enzymes which

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  7. Which one of the following palindromic base sequences in DNA can be ea...

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  8. An improved variety of transgenic basmati rice

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  9. DNA or RNA segment tagged with a radioative molecule is called

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  10. Genetic engineering has been successfully used for producing

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  11. The genetically -modified (GM) brinjal in India has been developed for

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  12. Some of the characteristics of Bt cotton are

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  13. Given below is a sample of a portion of DNA strand giving the base seq...

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  14. There is a restriction endonuclease called EcoRI. What does 'co' part ...

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  15. Agarose extracted from sea weeds finds use in

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  16. Maximum number of existing transgenic animals is of

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  17. The process of RNA interference has been used in the development of pl...

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  18. Read the following four statements (A-D) A. The first transgenic buf...

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  19. Silencing of mRNA has been used in producing transgenic plants resista...

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  20. Bacillus thuringiensis forms protein crystals which contain insecticid...

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