Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 23 of 99
The cellular branch of adaptive defense known as cell-mediated immunity is carried out directly by:
A
Neutrophils
B
B-lymphocytes
C
Erythrocytes
D
T-lymphocytes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: T-lymphocytes
Concept: Effector mechanisms of cell-mediated immunity.

Solution: T-lymphocytes (specifically Cytotoxic T-cells and Helper T-cells) direct cell-mediated immunity. They target intracellular pathogens, infected host cells, and foreign grafts directly without relying on circulating antibodies.

Why other options are incorrect:
  • Option A: Neutrophils mediate innate phagocytic responses.

  • Option B: B-lymphocytes mediate humoral (antibody-mediated) immunity.

  • Option C: Erythrocytes lack immune host-defense machinery.

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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