After a meal, glucose is absorbed from the small intestine into the cells that line the small intestine.
A scientist measures the concentration of glucose in the small intestine and in the cells that line it at different times after a meal.
The Table shows the results.
Table
| Time after meal in hours | Concentration of glucose in the small intestine in mmol/dm3\text{mmol/dm}^3mmol/dm3 | Concentration of glucose in the cells lining the small intestine in mmol/dm3\text{mmol/dm}^3mmol/dm3 |
|---|---|---|
| 0.5 | 50 | 20 |
| 1.0 | 30 | 20 |
| 2.0 | 15 | 20 |
| 3.0 | 5 | 20 |
Identify the first time in the Table when glucose cannot be absorbed by diffusion.
Explain how glucose is absorbed into the cells at 0.5 hours and at 3.0 hours.
Use data from the Table in your answer.
The cells lining the small intestine contain many mitochondria.
Suggest why.
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.