A-LevelBiologyCell membranes and transport9700/12 · May/June 2023 · Q171 Mark
The three main factors that affect the rate of diffusion across a membrane can be expressed by the relationship shown. rate of diffusion is proportional to surface area × concentration difference / thickness of membrane Which changes in the factors would result in the rate of diffusion doubling? 1 Surface area has doubled. 2 Concentration difference has halved. 3 Thickness of membrane has doubled. 4 Thickness of membrane has halved.
A1, 2 and 4
B1 and 3
C1 and 4 only
D2 and 3
✓ Correct answer
C: 1 and 4 only
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