Biology 9700 · 3 Enzymes
3.1 Mode of action of enzymes
Explain enzyme action, activation energy, and specificity using lock-and-key and induced-fit models, and investigate reaction rates experimentally.
- Questions
- 277
- Years
- 2001–2026
- Multiple choice
- 159
- Written answer
- 118
- Average marks
- 7
Where this subtopic appears
- Paper 1variants 01, 11, 12, 13, 14159
- Paper 2variants 02, 21, 22, 23, 2446
- Paper 3variants 03, 31, 32, 33, 34, 35, 36, 3742
- Paper 5variants 05, 51, 52, 5318
- Paper 4variants 41, 42, 4312
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | 2 | 18 | – | 20 |
| 2025 | – | 7 | 13 | 20 |
| 2023 | 4 | 10 | 10 | 24 |
| 2022 | 1 | 5 | 12 | 18 |
| 2021 | 2 | 13 | 11 | 26 |
| 2020 | 2 | 10 | 12 | 24 |
| 2019 | 4 | 11 | 9 | 24 |
| 2018 | 6 | 6 | 4 | 16 |
| 2017 | 3 | 15 | 14 | 32 |
| 2016 | 3 | 9 | 9 | 21 |
| 2015 | – | 8 | 13 | 21 |
| 2011 | – | 6 | – | 6 |
| 2010 | – | 4 | 5 | 9 |
| 2009 | – | 1 | 2 | 3 |
| 2007 | – | – | 1 | 1 |
| 2006 | – | 1 | 1 | 2 |
| 2005 | – | – | 1 | 1 |
| 2004 | – | 1 | 4 | 5 |
| 2003 | – | 1 | 2 | 3 |
| 2001 | – | – | 1 | 1 |
