A-LevelBiologyCell membranes and transportOct/Nov 2017Paper 1 Q181 Mark
The graph shows how the rate of entry of substance X into a cell changes as the concentration of substance X outside the cell increases. [Figure 18.1 - graph of rate of entry vs concentration] The diagram shows part of a cell surface membrane. [Figure 18.2 - diagram of cell surface membrane] Which pathways could substance X use to enter the cell?
A1 and 2
B1 only
C2 and 3
D2 only
✓ Correct Answer
The correct answer is A: 1 and 2
📋 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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