A-LevelBiologyEnzymesOct/Nov 2014Paper 1 Q131 Mark
Which words from the table correctly complete the paragraph about enzymes? When the pH of an environment is decreased below an enzyme's optimum pH, ………..1..... between adjacent ……….2... groups, holding the .....3...... structure, are disrupted.
A1: hydrogen and ionic, 2: R, 3: tertiary
B1: hydrogen, 2: hydroxyl, 3: secondary
C1: ionic and peptide, 2: R, 3: primary and tertiary
D1: peptide, 2: amine, 3: primary
✓ Correct Answer
The correct answer is A: 1: hydrogen and ionic, 2: R, 3: tertiary
📋 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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