A-LevelBiologyBiological moleculesOct/Nov 2014Paper 1 Q81 Mark
Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose whilst sucrose is formed from fructose and glucose. Which row shows the molecular formulae of the two disaccharides?
Amaltose: C₁₂H₂₂O₁₁, sucrose: C₁₂H₂₂O₁₁
Bmaltose: C₁₂H₂₂O₁₁, sucrose: C₁₂H₂₄O₁₂
Cmaltose: C₁₂H₂₄O₁₂, sucrose: C₁₂H₂₂O₁₁
Dmaltose: C₁₂H₂₄O₁₂, sucrose: C₁₂H₂₄O₁₂
✓ Correct Answer
The correct answer is A: maltose: C₁₂H₂₂O₁₁, sucrose: C₁₂H₂₂O₁₁
📋 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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