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C3.2.6—Lymphocytes

Lymphocytes explains how a specific barrier, pathogen interaction, immune mechanism, treatment response or population process contributes to protection against infectious disease.

Syllabus
First assessment 2025
Objective
C3.2.6
Level
SL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Typical marks1–3

Common command terms

  • Explain
  • Outline
  • Identify

Scoring notes

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

Recent exam appearances

November 2025Paper1A ["SL"] · TZ117[ 1 ]C3.2.6—Lymphocytes
May 2019Paper2 ["SL"] · TZ13(d)[ 2 ]C3.2.6—Lymphocytes
May 2014Paper2 ["SL"] · TZ12(c)(ii)[ 3 ]C3.2.6—Lymphocytes
Practice this objective

Coverage 2014–2025 · Updated 16 Jul 2026

Concept essentials

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