A-LevelBiologyBiological moleculesOct/Nov 2017Paper 1 Q91 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? [Figure 9.1 - table of molecular formulae for maltose and sucrose]
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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