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C1.2.10 (HL)—Anaerobic respiration in yeast

Yeast anaerobic respiration converts glucose or pyruvate to ethanol and carbon dioxide, supporting fermentation in bread, beer and bioethanol, supporting usable cellular work and measurable biological activity.

Syllabus
First assessment 2025
Objective
C1.2.10
Level
HL

Exam analysis

Chance of appearing5%of analysed past papers
Latest appearanceNovember 2024
Most common paperPaper1
Typical marks1

Common command terms

  • Explain
  • Identify

Recent exam appearances

November 2024Paper1 ["HL"] · TZ09[ 1 ]C1.2.10 (HL)—Anaerobic respiration in yeast
May 2021Paper1 ["HL"] · TZ19[ 1 ]C1.2.10 (HL)—Anaerobic respiration in yeast
May 2016Paper1 ["HL"] · TZ011[ 1 ]C1.2.10 (HL)—Anaerobic respiration in yeast
May 2015Paper3 ["HL"] · TZ19[ 6 ]C1.2.10 (HL)—Anaerobic respiration in yeast
November 2014Paper1 ["HL"] · TZ011[ 1 ]C1.2.10 (HL)—Anaerobic respiration in yeast
Practice this objective

Coverage 2013–2024 · Updated 15 Jul 2026

Concept essentials

  • Yeast fermentation produces ethanol and carbon dioxide.
  • Carbon dioxide from yeast makes bread dough rise.
  • Fermentation regenerates NAD so glycolysis can continue.
  • Yeast anaerobic respiration differs from human lactate production.
ConceptIB Biology HL