NEET 2009 Biology question

What is true about Bt toxin?

(1)Bt protein exists as active toxin in the Bacillus.
(2)The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.
(3)The concerned Bacillus has antitoxins.
(4)The inactive protoxin gets converted into active form in the insect gut.Correct

Answer: (4)

Solution

*Bacillus thuringiensis* forms crystalline Cry proteins during sporulation. These exist as inactive protoxins in the bacterium; when the insect larva ingests them, the alkaline pH of the gut solubilises the crystals and the protoxin is converted into the active toxin, which binds to midgut epithelial cells, creates

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Question ID VK-090196