Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 42 of 99
An adaptive immune response wherein T-cells directly identify antigens on infected cells and trigger cell lysis is known as:
A
Cell-mediated response
B
Humoral immune response
C
Hormonal immune response
D
Phagocytic response
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Cell-mediated response
Concept: T-cell cell-mediated immune mechanisms.

Solution: When T-lymphocytes (specifically CD8+ cytotoxic T-cells) interact directly with antigen-MHC Class I complexes on target cells to lyse them, the defense is termed a cell-mediated response.

Why other options are incorrect:
  • Option B: Humoral responses are mediated by soluble antibodies produced by B-cells.

  • Option C: Endocrine hormones do not mediate adaptive cell-mediated immunity.

  • Option D: Phagocytosis involves engulfment by macrophages/neutrophils, not direct T-cell cytotoxicity.

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