Biology Biotechnology and Its Application Biotechnology Application in Agriculture Single Correct MCQ
Published on: August 12, 2026

Bt toxin protein crystals present in bacterium Bacillus thuringiensis, do not kill the bacteria because

A
bacteria are resistant to the toxin
B
bacteria enclose toxins in a special sac
C
toxins occur as inactive protoxins in bacteria
D
None of the above

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The correct answer is:
C

Bacillus thuringiensis produces Bt toxin in the form of inactive protoxins (crystal proteins). These protoxins become active only in the alkaline gut of susceptible insects. Therefore, the bacteria themselves are not harmed by the toxin.

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