A student investigated whether an alkaline replacement liquid could take the place of bile in a mixture containing lipid and lipase. The mixture also contained hydrochloric acid from the stomach. The student kept the amount of lipid and lipase, the temperature and the time constant. The replacement liquid was alkaline but did not change the size of the lipid droplets.
| Liquid added to the mixture | Rate of lipid breakdown (mg per minute) |
|---|---|
| None | 0.3 |
| Replacement liquid | 0.8 |
| Bile | 2.4 |
Explain whether the results support using the replacement liquid instead of bile. Refer to the results and to both effects of bile.
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.