C1.1.2—Role in metabolism
Metabolism is the total network of enzyme-controlled chemical reactions that build, break down and transform molecules inside living cells and organisms.
- Syllabus
- First assessment 2025
- Objective
- C1.1.2
- Level
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceNovember 2016
Most common paperPaper2
Typical marks1–4
Common command terms
- Define
- Explain
Recent exam appearances
November 2016Paper2 ["SL"] · TZ03(a)[ 1 ]C1.1.2—Role in metabolism
May 2013Paper3 ["SL"] · TZ2C2(b)[ 4 ]C1.1.2—Role in metabolism
Practice this objective
Coverage 2013–2016 · Updated 15 Jul 2026
Concept essentials
- Metabolism is the total set of chemical reactions in cells or organisms.
- Metabolic pathways are controlled by specific enzymes.
- Each pathway step may depend on a different enzyme.
- Inhibiting or lacking an enzyme can block a pathway.