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21/01/2022 1:59 pm
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A protoxin is
(a) A primitive toxin
(b) A denatured toxin
(c) Toxin produced by protozoa
(d) Inactive toxin
1 Answer
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21/01/2022 1:59 pm
Correct answer: (d) Inactive toxin
Explanation:
Bt toxin is a protein. This toxin does not kill the Bacillus because the Bt toxin protein exists as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.