Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 7 of 99
Humoral immunity is primarily mediated by which specific lineage of cells?
A
Killer T-cells
B
B-cells
C
Helper T-cells
D
Null cells
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: B-cells
Concept: Humoral vs. Cell-Mediated Immune Responses.

Solution: Humoral immunity relies on soluble proteins called antibodies secreted into body fluids (humors). B-cells differentiate into effector plasma cells that produce these target-specific antibodies.

Why other options are incorrect:
  • Option A: Cytotoxic/Killer T-cells direct cell-mediated immunity by killing infected cells.

  • Option C: Helper T-cells assist both branches by secreting activating cytokines.

  • Option D: Null cells (e.g., NK cells) participate in non-specific innate immunity.

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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