STANDARDBotany-Genetic Engineering
STANDARD Botany Bt Crops MCQ Question
Type: MCQ-conceptual-Medium
Choose the correct option for the toxic protein produced by B. thuringiensis
A
It acts in acidic medium and binds to epithelial cells of foregut
B
It acts in neutral medium and binds to epithelial cells of hindgut
C
It acts in alkaline medium and binds to epithelial cells of foregut
D
It acts in alkaline medium and binds to epithelial cells of midgut
Correct Answer
Option D
Detailed Explanation
The Bt toxin protein exists as inactive protoxin but once ingested by insect it is converted into active form of toxin due to alkaline pH of alimentary canal that solubilizes the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores which cause cell swelling and lysis and finally cause death of insect.
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