A-LevelBiologyCell membranes and transportFeb/Mar 2022Paper 1 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
The correct answer is B: 1 and 2 only
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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