Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 5 of 99
Autoimmune diseases operate on the principle of:
A
Self against self
B
Self against antigens
C
Antigen against self
D
Antigen self destroyed
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Self against self
Concept: Autoimmunity and failure of self-tolerance.

Solution: Autoimmunity occurs when the adaptive immune system loses self-tolerance, leading auto-reactive antibodies or T-cells to attack the body's own tissues and self-antigens ("self against self").

Why other options are incorrect:
  • Option B: "Self against antigens" describes a normal, healthy immune response against foreign pathogens.

  • Option C & Option D: These phrases misstate the biological relationship; host auto-reactive components act against host structures.

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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