Biology 9700 · AS & A Level · Transport mechanisms
Transport mechanisms — practice question
Visking tubing may be used to explore the properties of cell membranes. A student performed an experiment with Visking tubing to investigate osmosis. Fig. 3.1 shows an outline of the investigation.
(a)[3]
The student's Visking tubing did not allow sucrose to pass through. Explain the results shown in Table 3.1.
(b)[4]
Describe and explain the effects on red blood cells when they are immersed in different concentrations of sodium chloride, as shown in Fig. 3.2.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “At $0$, $0.4$ or $0.8\,\text{mol dm}^{-3}$ sucrose, water leaves the Visking tubing” …