Biology Biotechnology and Its Application Biotechnology Application in Agriculture Single Correct MCQ
Published on: August 21, 2026

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

A
Bacteria are resistant to the toxin
B
Toxin is immature
C
Toxin is inactive
D
Bacteria encloses toxin in a special sac

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The correct answer is:
C

In Bacillus thuringiensis, Bt toxin is produced as an inactive protoxin, so it does not harm the bacteria itself. It becomes active only in the alkaline gut of insects.

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