A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2022 · Q161 Mark
Which relationships could be investigated using a colorimeter? 1 the effect of light intensity on the rate at which a solution of a light-sensitive dye changes from green to colourless 2 the effect of temperature on the rate of breakdown of cell membranes in tissues with pigmented cells, such as beetroot (red beet) 3 the effect of pH on the rate of release of oxygen from the breakdown of hydrogen peroxide by catalase 4 the effect of light intensity on the rate of change of skin colour of lizards that become paler in bright light
A1, 2, 3 and 4
B1 and 2 only
C1 and 4 only
D2 and 3 only
✓ Correct answer
B: 1 and 2 only
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