Q.

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

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a

bacteria are resistant to the toxin

b

bacterial cells produce mucus

c

toxin exist as inactive protoxins inside bacterial cells

d

bacteria encloses toxin in a special sac

answer is C.

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Detailed Solution

The Bt toxin protein exist as inactive protoxins inside bacterial cells 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 solubilise the crystals.
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