Bt toxin protein crystals present in bacterium B. thuringie…

Biology Biotechnology and Its Application NCERT Single Correct MCQ

Published on: August 11, 2026

Bt toxin protein crystals present in bacterium B. thuringiensis do not kill the bacteria even though it is produced in them because

bacteria are resistant to the toxin

bacteria enclose toxins in a special sac

toxins occur as inactive protoxin in bacteria

none of these

Text Solution

Verified by Experts

The correct answer is:

• In Bacillus thuringiensis, Bt toxin is produced as an inactive protoxin.

• It only becomes active when ingested by susceptible insects, so the bacterium itself is not harmed.

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