Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 18 of 99
A specialized group of immune cells (such as macrophages and dendritic cells) that internalize, process, and present peptide fragments on their cell surface for lymphocyte activation are called:
A
Interferons
B
Natural killer cells
C
Vaccines
D
Antigen-presenting cells
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Antigen-presenting cells
Concept: Antigen presentation mechanisms.

Solution: Antigen-presenting cells (APCs) phagocytose pathogens, process proteins into short peptides, and display them on surface Class II MHC complexes to activate naive T-lymphocytes.

Why other options are incorrect:
  • Option A: Interferons are antiviral signaling cytokines secreted by infected host cells.

  • Option B: Natural killer cells lyse virus-infected or tumor cells directly.

  • Option C: Vaccines are biological preparations used to induce active immunity.

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