The Bt is not toxic to human beings and bacteria Bacillus t…

Biology Biotechnology and Its Application All Topic Question For Revision Test Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 21, 2026

The Bt is not toxic to human beings and bacteria Bacillus thuringinensis because -

The pro Bt toxin activation requires temperature above human body temperature

The Bt toxin recognized only insect-specific targets

The pro Bt toxin activation requires pH lower than that present in this bacteria

Conversion of pro Bt toxin to Bt toxin takes place in highly alkaline conditions

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The correct answer is:

Bt toxin is produced as an inactive protoxin (pro-Bt toxin). It becomes active only in the highly alkaline gut of susceptible insects. Humans and Bacillus thuringiensis do not provide these conditions, so the toxin is not activated and is therefore non-toxic to them.

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