Crystals of Bt toxin produced by some bacteri | vedclass

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Question

(A) The correct answer is $A$. In bacteria,the $Bt$ toxin is produced in an inactive form known as a protoxin. This inactive form does not harm the ba

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the toxin is inactive

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(A) The correct answer is $A$. In bacteria,the $Bt$ toxin is produced in an inactive form known as a protoxin. This inactive form does not harm the bacterial cell because it requires an alkaline $pH$ (found in the gut of specific insects) to be converted into its active,toxic form. Once ingested by the insect,the alkaline environment solubilizes the crystals and activates the toxin,which then binds to the midgut epithelial cells,causing cell lysis and death of the insect.

Crystals of $Bt$ toxin produced by some bacteria do not kill the bacteria themselves because

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