A researcher compares respiration in two groups of cells.
| Group | Cells studied | Oxygen available | Glucose molecules broken down | ATP molecules made |
|---|---|---|---|---|
| A | Cells from a plant stem | Absent | 12 | 24 |
| B | Cells from a mammal | Supplied continuously | 8 | 240 |
Calculate the average number of ATP molecules made per molecule of glucose for group A and for group B.
Give the products formed by the cells from the plant stem when oxygen is absent.
Explain why group B makes more ATP per molecule of glucose than group A.
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.