A scientist places different masses of living yeast cells in three identical insulated containers. Each culture is supplied with plenty of glucose and oxygen for 30 minutes.
| Culture | Rate of glucose breakdown by respiration (mg min⁻¹) | Temperature rise (°C) |
|---|---|---|
| P | 0.5 | 0.4 |
| Q | 1.0 | 0.8 |
| R | 1.5 | 1.2 |
The scientist concludes:
“Respiration is exothermic, and all the energy transferred during respiration leaves the cells as heat.”
Evaluate the scientist’s conclusion.
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.