Multiple choice

Insecticidal protein is present in the protein crystals of Bacillus thuringiensis. This protein is actually

  1. binded with the epithelial cells of the midgut of the insect ultimately leading to its death

  2. coded by multiple genes which also include the gene cry

  3. activated the acidic pH of the insect foregut.

  4. cannot kill the carrier bacterium, since it is itself resistant to this toxin.
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A Correct answer
Explanation

Bacillus thuringiensis form a solid protein crystal, the parasporal body, next to their endospores during spore formation. The parasporal body contains protein toxins that has been found to kill over 100 species of moths by dissolving in the alkaline gut of caterpillars and destroying the epithelium.

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