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 26, 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

Text Solution

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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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