Vaccines and their role · NCERT Biology

Which biological molecule is typically used as a 'toxoid' in vaccines for diseases like Tetanus?

  1. Inactivated viral RNA
  2. Modified bacterial polysaccharides
  3. Inactivated bacterial exotoxins
  4. Purified viral proteins
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Correct answer: Inactivated bacterial exotoxins

Toxoid vaccines use bacterial toxins that have been treated (usually with formalin) to destroy their toxicity while preserving their immunogenicity. This allows the body to form antibodies against the toxin itself.

Difficulty: Medium Question 6 of 20

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