The table shows the time taken for all of the starch in a mixture to be broken down by amylase at four different pH values. At which pH was the rate of starch breakdown twice the rate at pH 5?
Table: The time taken for all of the starch in a mixture to be broken down by amylase at four different pH values
| pH | Time taken for all of the starch to be broken down in s |
|---|---|
| 5 | 240 |
| 6 | 120 |
| 7 | 90 |
| 8 | 60 |
pH 5
pH 6
pH 7
pH 8
179 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.