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Question
The trigger for activation of toxin of Bacillus thuringiensis is ______ of gut.
Fill in the Blanks
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Solution
The trigger for activation of toxin of Bacillus thuringiensis is alkaline pH of gut.
Explanation:
The Bt toxin exists as an inactive protoxin in the bacterium. When ingested by an insect, the alkaline environment of the insect’s midgut solubilises the crystalline protoxin, converting it into an active toxin. This activated toxin binds to the midgut epithelial cells, creating pores that cause cell swelling, lysis, and eventually death of the insect.
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