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Q.
The Bt toxin is used for killing nematodes in crop plant. But, it is non-toxic to human. Select the correct reason for this
CMC MedicalCMC Medical 2015
Solution:
The $ Bt $ toxin protein exist as inactive proctoreins, but once an insects ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals. The activated toxin binds to the surface of midgut epithelial cells and create pores that causes cell swelling and lysis and eventically cause death of the insect.