. Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because

(a)           Bacteria are resistant to toxin        

(b)          Toxin is immature

(c)           Toxin is inactive                                

(d)          Bacteria encloses toxin in a special sac


Best Answer

(c)       Actually, the Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilize the crystals.

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