Home Biology Biotechnology and Its Application Previous Year Questions Bacillus thuringiensis forms protein crystal…
Biology Biotechnology and Its Application Previous Year Questions Single Correct MCQ
Published on: August 13, 2026

Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein

A
Binds with epithelial cells of midgut of the insect pest ultimately killing it.
B
Is coded by several genes including the gene cry.
C
Is activated by acid pH of the foregut of the insect pest.
D
Does not kill the carrier bacterium which is itself resistant to this toxin.

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The correct answer is:
A

The activated Bt toxin binds to the epithelial cells of the insect midgut, creates pores in the cell membrane, causing cell lysis and death of the insect.

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