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C3.2.14—Antibiotic resistance evolution

Antibiotic resistance evolution explains how a specific barrier, pathogen interaction, immune mechanism or treatment response contributes to protection against infectious disease.

Syllabus
First assessment 2025
Objective
C3.2.14
Level
HL

Exam analysis

Chance of appearing7%of analysed past papers
Latest appearanceNovember 2023
Most common paperPaper1
Typical marks1–2

Common command terms

  • Explain
  • Compare
  • Discuss
  • Suggest
  • Identify
  • Describe
  • State
  • Outline

Scoring notes

Common mistake
Saying antibiotics cause directed mutations instead of selecting pre-existing or transferred resistance.

Recent exam appearances

November 2023Paper1 ["HL"] · TZ215[ 1 ]C3.2.14—Antibiotic resistance evolution
November 2023Paper3 ["HL"] · TZ210(c)[ 2 ]C3.2.14—Antibiotic resistance evolution
November 2023Paper3 ["HL"] · TZ210(a)[ 1 ]C3.2.14—Antibiotic resistance evolution
May 2023Paper2 ["HL"] · TZ13(a)[ 3 ]C3.2.14—Antibiotic resistance evolution
May 2022Paper1 ["HL"] · TZ219[ 1 ]C3.2.14—Antibiotic resistance evolution
Practice this objective

Coverage 2016–2023 · Updated 16 Jul 2026

Concept essentials

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