Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 55 of 99
Vaccines for diphtheria and tetanus use inactivated bacterial exotoxins to generate protective immunity; these are termed:
A
Toxoid vaccines
B
Live-attenuated vaccines
C
Inactivated viral vaccines
D
Subunit mRNA vaccines
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Toxoid vaccines
Concept: Vaccine classifications.

Solution: Toxoid vaccines are manufactured by detoxifying bacterial exotoxins (e.g., using formaldehyde). They retain immunogenic epitopes, allowing the immune system to produce neutralizing anti-toxin antibodies.

Why other options are incorrect:
  • Option B: Live-attenuated vaccines use weakened live pathogens.

  • Option C: Diphtheria is caused by a bacterium (Corynebacterium diphtheriae), not a virus.

  • Option D: mRNA vaccines deliver genetic sequences encoding viral proteins.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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