A scientist investigated a human lipase. The scientist added equal masses of lipase to two mixtures containing the same mass of lipid. Excess lipid remained in both mixtures throughout the investigation.
The table shows the cumulative mass of lipid broken down.
| Time in minutes | Mass of lipid broken down at 37 °C in mg | Mass of lipid broken down at 50 °C in mg |
|---|---|---|
| 0 | 0.0 | 0.0 |
| 2 | 8.0 | 7.0 |
| 4 | 16.0 | 9.0 |
| 6 | 24.0 | 9.0 |
Use the data to compare the rates of lipid breakdown at 37 °C and 50 °C. Explain why the rates change in these ways.
304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.