Animal cells were grown in a liquid medium. The cells were respiring faster in condition Q than in condition P.
The table shows the concentrations of dissolved gases inside and outside the cells.
| Measurement | Condition P in μmol dm−3\mu\text{mol dm}^{-3}μmol dm−3 | Condition Q in μmol dm−3\mu\text{mol dm}^{-3}μmol dm−3 |
|---|---|---|
| Oxygen concentration outside the cells | 220 | 220 |
| Oxygen concentration inside the cells | 170 | 80 |
| Carbon dioxide concentration outside the cells | — | 15 |
| Carbon dioxide concentration inside the cells | — | 70 |
Use the data to explain why oxygen diffused into the cells faster in condition Q than in condition P.
Explain the direction in which carbon dioxide diffused in condition Q.
140 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.