A laboratory grows animal cells in a culture vessel. Glucose is the only respiratory substrate available. During each stage, some of the ATP is supplied by aerobic respiration and the rest is supplied by anaerobic respiration.
Each glucose molecule supplies 30 ATP molecules when respired aerobically and 2 ATP molecules when respired anaerobically.
| Stage | ATP molecules required | Percentage of ATP supplied by aerobic respiration |
|---|---|---|
| 1 | 1.20 × 10⁹ | 70% |
| 2 | 1.50 × 10⁹ | 40% |
Calculate the percentage increase in the total number of glucose molecules broken down from Stage 1 to Stage 2.
Give your answer to the nearest whole number.
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.