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Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYBiotechnology and its Applications1 Mark
MCQ
A protoxin is:
  • A
    A primitive toxin.
  • B
    A denatured toxin.
  • C
    Toxin produced by protozoa.
  • D
    Inactive toxin.
✓

Answer

  1. Inactive toxin.

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.

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