Oxygen diffuses into a cell.
A scientist changes the concentration of oxygen outside the cell. The concentration of oxygen inside the cell stays the same.
The Table shows the results.
Table
| Concentration of oxygen outside the cell in arbitrary units | Concentration of oxygen inside the cell in arbitrary units | Rate of diffusion of oxygen into the cell in arbitrary units |
|---|---|---|
| 10 | 5 | 2 |
| 20 | 5 | 6 |
| 30 | 5 | 10 |
| 40 | 5 | 14 |
Calculate the difference in oxygen concentration between the outside and the inside of the cell when the concentration outside the cell is 30 arbitrary units.
Describe the relationship between the difference in oxygen concentration and the rate of diffusion.
Use data from the Table in your answer.
The cell uses oxygen in respiration.
Explain how this keeps oxygen diffusing into the cell.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.