Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 26 of 99
Intracellular viral infections and abnormal tumor host cells are directly lysed and killed by which innate lymphoid cells?
A
Natural killer cells
B
Plasma B-cells
C
Eosinophils
D
Erythrocytes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Natural killer cells
Concept: Innate cellular cytotoxicity.

Solution: Natural killer (NK) cells identify host cells lacking proper self Class I MHC expression or displaying stress motifs, releasing perforin and granzymes to induce apoptosis.

Why other options are incorrect:
  • Option B: Plasma B-cells secrete soluble antibodies; they do not lyse target cells directly via cell-to-cell contact.

  • Option C: Eosinophils target large extracellular parasites like helminths.

  • Option D: Erythrocytes carry respiratory gases.

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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