C1.1 Enzymes and metabolism
Enzymes and metabolism explain how catalysts, active sites, reaction conditions and pathway regulation control cellular chemical reactions in living systems.
- Syllabus
- First assessment 2025
- Topic
- C1.1
- Level
- SL
What you’ll learn
10 learning objectivesChoose one objective for a focused lesson, or study the complete topic.
Exam analysis
An aggregate view of how the complete C1.1 Enzymes and metabolism appears across past papers.
Chance of appearing54%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper3
Most tested objectives
- C1.1.8—Effects on enzyme activity43 questions
- C1.1.9—Measuring enzyme reactions13 questions
- C1.1.3—Anabolic and catabolic reactions10 questions
Common question formats
- Calculation
- Data analysis
- Definition or recall
- Diagram interpretation
- Experimental design
- Extended response
- Graph interpretation
- Structured response
Exam question appearances
November 2025Paper1A ["SL"] · TZ14[ 1 ]C1.1.3—Anabolic and catabolic reactions
November 2025Paper1B ["SL"] · TZ13(a)[ 1 ]C1.1.9—Measuring enzyme reactions
May 2025Paper1A ["SL"] · TZ35[ 1 ]C1.1.10—Effect of enzymes on activation energy
May 2025Paper1A ["SL"] · TZ15[ 1 ]C1.1.5—Induced-fit binding
May 2025Paper1B ["SL"] · TZ34(e)[ 2 ]C1.1.9—Measuring enzyme reactions
Coverage 2010–2025 · Updated 15 Jul 2026