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

binds with epithelial cells of midgut of the insect pest ultimately killing it

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is coded by several genes including the gene cry

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is activated by acid pH of the foregut of the insect pest

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does not kill the carrier bacterium which is itself resistant to his toxin

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Solution

The correct option is A binds with epithelial cells of midgut of the insect pest ultimately killing it
Bacillus thuringiensis binds with epithelial cells of the midgut of the insect pest ultimately killing it and forms protein crystals which contain insecticidal protein.
So, the correct option is 'Binds with epithelial cells of the midgut of the insect pest ultimately killing it'.

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