Potato tuber cells are kept in a sealed container without oxygen. A numerical model of their respiration uses this ratio.
| Substance | Relative number of molecules |
|---|---|
| glucose broken down | 1 |
| ethanol formed | 2 |
| carbon dioxide formed | 2 |
The model is changed so that 20 more glucose molecules are broken down.
Which change to the products agrees with the model?
Ethanol increases by 20 molecules and carbon dioxide increases by 20 molecules.
Ethanol increases by 40 molecules and carbon dioxide increases by 40 molecules.
Ethanol increases by 20 molecules and carbon dioxide increases by 40 molecules.
Ethanol increases by 40 molecules and carbon dioxide increases by 20 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.