Home Biology Biotechnology and Its Application Statement Based Questions Bacillus thuringiensis forms the protein cry…
Biology Biotechnology and Its Application Statement Based Questions Single Correct MCQ
Published on: August 13, 2026

Bacillus thuringiensis forms the protein crystals which contain a toxic insecticidal protein. This protein

( I) is activated by alkaline pH of the gut of the insect pest.

(II) binds with the epithelial cells of the midgut of the insect pest ultimately killing it.

(III) does not kill the carrier bacterium which is itself resistance to this toxin.

Which of the statements given above are correct?

A
(I) and (II)
B
(I) and (III)
C
(II) and (III)
D
(I), (II) and (III)

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Text Solution

Verified by Experts
The correct answer is:
D

All statements are correct about Bt toxin:

• Activated in alkaline insect gut (I)

• Binds to midgut epithelial cells and kills insect (II)

• Bacillus thuringiensis is resistant to its own toxin (III)

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