Living apple cells can continue to respire when oxygen becomes unavailable. The table gives the approximate ATP yield in each condition.
| Condition | ATP molecules formed per glucose molecule |
|---|---|
| oxygen available | 30 |
| oxygen unavailable | 2 |
A cell must form 240 million ATP molecules. Compared with the oxygen-available condition, how many additional glucose molecules are needed when oxygen is unavailable?
8 million glucose molecules
112 million glucose molecules
16 million glucose molecules
120 million glucose molecules
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.