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CUET · BIOLOGY · PYQ PAPER 2023

Which one of the followings is not a feature of insecticidal protein crystals formed by Bacillus thuringiensis:

  1. A When formed they exist as inactive protoxin.
  2. B They are converted into an active form of toxin in the alkaline pH of the gut, which solubilize the crystals.
  3. C They are effective against certain insects such as lepidopterans, coleopterans and dipterans.
  4. D The activated toxin does not bind the surface of midgut epithelial cells which leads to pore formation, cell swelling and lysis.
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(D) The activated toxin does not bind the surface of midgut epithelial cells which leads to pore formation, cell swelling and lysis.

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The activated toxin does not bind the surface of midgut epithelial cells which leads to pore formation, cell swelling and lysis.
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