A scientist measures the number of glucose molecules used and the number of ATP molecules made in one minute by two cultures of the same type of animal cell. One culture has oxygen available and the other has no oxygen.
| Culture | Glucose molecules used (× 10¹⁵) | ATP molecules made (× 10¹⁵) |
|---|---|---|
| with oxygen available | 4.0 | 120 |
| without oxygen | 6.0 | 12 |
Calculate the number of molecules of ATP made per molecule of glucose for each culture. Compare your answers and explain why they differ.
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.