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C3.2.10—Immunity from memory cells

Immunity from memory cells explains how a specific barrier, pathogen interaction, immune mechanism or treatment response contributes to protection against infectious disease.

Syllabus
First assessment 2025
Objective
C3.2.10
Level
HL

Exam analysis

Chance of appearing3%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper2
Typical marks1–3

Common command terms

  • State
  • Suggest
  • Identify
  • Explain

Scoring notes

Common mistake
Confusing plasma cells, memory cells and helper T-cells in the activation sequence.

Recent exam appearances

May 2025Paper2 ["HL"] · TZ25(b)[ 2 ]C3.2.10—Immunity from memory cells
May 2021Paper1 ["HL"] · TZ237[ 1 ]C3.2.10—Immunity from memory cells
November 2019Paper2 ["HL"] · TZ01(f)(ii)[ 3 ]C3.2.10—Immunity from memory cells
Practice this objective

Coverage 2019–2025 · Updated 16 Jul 2026

Concept essentials

  • Immunity from memory cells has to be linked to the exact pathogen, cell, molecule or population process involved.
  • The biological effect of immunity from memory cells depends on the sequence from trigger to protective outcome.
  • Clear distinctions within immunity from memory cells prevent confusion with neighbouring immune responses.
  • Evidence for immunity from memory cells is strongest when mechanism and consequence are explained together.
ConceptIB Biology HL