The Bt toxin is not toxic to human beings because

Biology Biotechnology and Its Application Biotechnology Application in Agriculture Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

The pro Bt toxin activation requires temperature above human body temperature

The Bt toxin recognizes only insect-specific targets

The Bt toxin formation from pre Bt toxin requires pH lower than that present in human stomach

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

Text Solution

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The correct answer is:

Bacillus thuringiensis (Bt) produces an inactive protoxin (pro-Bt toxin). It becomes active only in the alkaline gut of certain insects. Humans have an acidic stomach, so the protoxin is not activated and is therefore not toxic to humans.

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