February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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13Cell MembranesHard1 mark
The solubility in water of different regions of the cell surface membrane changes with the distance of each region from the centre of the membrane.
Which graph shows the approximate relationship between the distance of each region from the centre of the cell surface membrane and its solubility in water?
Graph A: increasing solubility in water (y-axis) against distance from the centre of the cell surface membrane in nm (x-axis, -4 to 4); a rectangular step shape with low solubility between about -3 and 3 nm and high solubility beyond ±3 nm
Graph B: increasing solubility in water (y-axis) against distance from the centre of the cell surface membrane in nm (x-axis, -4 to 4); a rectangular step shape with high solubility between about -3 and 3 nm and low solubility beyond ±3 nm
Graph C: increasing solubility in water (y-axis) against distance from the centre of the cell surface membrane in nm (x-axis, -4 to 4); a V shape, lowest at the centre (0 nm) and rising in a straight line towards -4 and 4 nm
Graph D: increasing solubility in water (y-axis) against distance from the centre of the cell surface membrane in nm (x-axis, -4 to 4); a triangular peak shape, highest at the centre (0 nm) and falling in a straight line towards -4 and 4 nm