A-LevelBiologyEnzymesOct/Nov 2019Paper 1 Q161 Mark
An experiment was carried out to compare the effect of pH on the activity of an enzyme that was in solution and the same enzyme that had been immobilised on a gel. All other variables were kept the same. The results are shown in the graph. [Figure 16.1]
AThe primary structure has changed.
BThe secondary structure has changed.
CThe tertiary structure has changed.
DThe quaternary structure has changed.
✓ Correct Answer
The correct answer is C: The tertiary structure has changed.
📋 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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