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C3.2.9—Clones of plasma cells

Clones of plasma cells explains how a specific barrier, pathogen interaction, immune mechanism or treatment response contributes to protection against infectious disease.

Syllabus
First assessment 2025
Objective
C3.2.9
Level
HL

Exam analysis

Chance of appearing4%of analysed past papers
Latest appearanceNovember 2019
Most common paperPaper1
Typical marks1

Common command terms

  • Identify
  • State

Scoring notes

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

Recent exam appearances

November 2019Paper1 ["HL"] · TZ037[ 1 ]C3.2.9—Clones of plasma cells
November 2018Paper1 ["HL"] · TZ037[ 1 ]C3.2.9—Clones of plasma cells
November 2017Paper2 ["HL"] · TZ02(c)[ 1 ]C3.2.9—Clones of plasma cells
May 2014Paper1 ["HL"] · TZ135[ 1 ]C3.2.9—Clones of plasma cells
May 2012Paper1 ["HL"] · TZ235[ 1 ]C3.2.9—Clones of plasma cells
Practice this objective

Coverage 2012–2019 · Updated 16 Jul 2026

Concept essentials

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