Why is \( B t \) toxin not toxic to \( \mathrm{P} \) human beings? ...

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Why is \( B t \) toxin not toxic to
\( \mathrm{P} \) human beings?
AMU 2011
(a) The toxin recognises only insect
W specific targets
(b) \( B t \) toxin activation requires temperature above the human body temperature
(c) \( \mathrm{Bt} \) toxin formation from pro \( \mathrm{Bt} \) state which requires \( \mathrm{pH} \) lower than one present in human stomach
(d) Conversion of pro \( B t \) to \( B t \) state takes place only in highly alkaline condition
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