CAIE A Level Biology 9700 · Enzymes
A student investigated the effect of temperature on the rate of a protease-catalysed reaction. The initial rate of reaction (in arbitrary units) was measured at different temperatures. The results are shown in the table.
| Temperature / °C | Initial rate / arbitrary units |
|---|---|
| 10 | 2.1 |
| 20 | 4.3 |
| 30 | 8.5 |
| 40 | 12.0 |
| 50 | 15.2 |
| 60 | 10.1 |
| 70 | 3.5 |
Explain the relationship between temperature and the rate of this enzyme-catalysed reaction, using the data in the table.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.