A scientist placed animal liver cells in a glucose solution. Oxygen was supplied throughout.
The scientist measured the volume of oxygen used by the cells at 35 ∘C35\ ^\circ\text{C}35 ∘C. The cells were then heated to 55 ∘C55\ ^\circ\text{C}55 ∘C for 10 minutes and cooled back to 35 ∘C35\ ^\circ\text{C}35 ∘C before the measurement was repeated.
| Measurement | Volume of oxygen used in 10 minutes in cm3\text{cm}^3cm3 |
|---|---|
| before heating | 4.8 |
| after heating and cooling | 0.6 |
Suggest why the volume of oxygen used did not return to its original value after the cells were cooled back to 35 ∘C35\ ^\circ\text{C}35 ∘C.
98 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.