NEET Biology question

Study the following statements regarding *Bt* toxins produced by the bacteria *Bacillus thuringiensis* and select the correct one.

(A)Most strains of *Bacillus thuringiensis* produce proteins that kill certain insects such as lepidopterans, coleopterans and dipterans
(B)*Bt* toxin proteins do not kill the bacteria themselves because the toxin proteins occur in an active form called protoxins
(C)When an insect ingests the inactive *Bt* toxin, it is converted to an active form of toxin due to the alkaline pH of the gut, which solubilizes the protein toxin crystalsCorrect
(D)All of these

Answer: (C)

Solution

Statement (b) is self-contradictory and false (protoxins are, by definition, an inactive form, not an "active form"), so "all of these" cannot be correct, and the most precisely

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Question ID VK-125750