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C1.2.17 (HL)—Lipids vs. carbohydrates as substrates

Lipids release more energy than carbohydrates per gram because they are more reduced and contain more carbon-hydrogen bonds, supporting usable cellular work and measurable biological activity.

Syllabus
First assessment 2025
Objective
C1.2.17
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceNovember 2024
Most common paperPaper2
Typical marks2

Common command terms

  • Distinguish
  • State
  • Explain

Recent exam appearances

November 2024Paper2 ["HL"] · TZ04(d)[ 2 ]C1.2.17 (HL)—Lipids vs. carbohydrates as substrates
Practice this objective

Coverage 2024–2024 · Updated 15 Jul 2026

Concept essentials

  • Lipids contain more energy per gram than carbohydrates.
  • Triglycerides are more reduced and contain many carbon-hydrogen bonds.
  • Beta oxidation can generate acetyl-CoA for aerobic respiration.
  • Carbohydrates enter glycolysis more directly than lipids.
ConceptIB Biology HL