Two equal masses of sheep muscle tissue are stimulated to contract for five minutes. The table shows the amount of glucose broken down by each pathway.
| Sample | Glucose broken down aerobically (μmol) | Glucose broken down anaerobically (μmol) |
|---|---|---|
| P | 18 | 2 |
| Q | 6 | 14 |
Aerobic respiration supplies about 30 μmol of ATP per μmol of glucose. Anaerobic respiration supplies about 2 μmol of ATP per μmol of glucose.
Calculate how many times as much ATP was supplied in sample P as in sample Q. Give your answer to two significant figures.
Explain which sample is expected to become fatigued first. Your answer should refer to a product of respiration.
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.