Bt endotoxin that exists as inactive pro...

Bt endotoxin that exists as inactive protoxin is converted in to active toxin once bollworm ingests it due to

Acidic condition of the gut

Optimum plasma osmolality in the gut

Action of digestive enzymes in the gut

Alkaline condition of the gut

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(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.

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

In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to

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

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. Bacillus thuringiensis is a

Assertion: Crystal protein does not kill the Bacillus & kill only insect Reason :In Bacillus it exist as inactive proteins but in insect it is converted into an active form due to acidic pH of the gut

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:

NTA MOCK TESTS-NTA NEET SET 33-BIOLOGY

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