NEET 2019 Biology question

What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?

(1)Body temperature
(2)Moist surface of midgut
(3)Alkaline pH of gutCorrect
(4)Acidic pH of stomach

Answer: (3)

Solution

Bacillus thuringiensis forms protein crystals (Cry proteins) that contain an inactive protoxin. When an insect ingests the crystals, the alkaline pH of its gut solubilises the crystals and activates the toxin, which then binds to the

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Question ID VK-092548