Biology Immunity MDCAT 2014
PMDC Verified Question 98 of 99
T-lymphocytes recognize antigen and attack microorganisms or transplanted organ and tissues. This effect is called:
A
Cell-mediated response
B
Active immunity
C
Humoral immune response
D
Passive immunity
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:

The adaptive immune system is divided into two broad branches based on the effector mechanism: humoral (antibodies) and cell-mediated (cells).

Formula:

None

Solution:

  • T-lymphocytes (specifically Cytotoxic T-cells) directly engage and destroy infected host cells, cancer cells, or foreign transplant cells.


  • Because this destruction is carried out directly by physical cell-to-cell contact rather than by secreted molecules, it is termed a cell-mediated response.


Why other options are incorrect:

  • Humoral response: Driven by B-cells and the antibodies they secrete into the body's humors (fluids).

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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