The table shows the pH at which each of four protein-digesting enzymes works fastest. Which enzyme is most likely to have come from the stomach of a human?
Table: The pH at which each of four protein-digesting enzymes works fastest
| Enzyme | pH at which the enzyme works fastest |
|---|---|
| W | 7.4 |
| X | 5.5 |
| Y | 2.0 |
| Z | 8.5 |
Enzyme W
Enzyme X
Enzyme Y
Enzyme Z
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.