A-LevelBiologyBiological moleculesOct/Nov 2011Paper 1 Q81 Mark

Two disaccharides are cellobiose and sucrose. Cellobiose 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?

Q: What topic does this question test?

This question tests Biological molecules in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Acellobiose: C12H22O11 sucrose: C12H22O11

Bcellobiose: C12H22O11 sucrose: C12H24O12

Ccellobiose: C12H24O12 sucrose: C12H22O11

Dcellobiose: C12H24O12 sucrose: C12H24O12

✓ Correct Answer

The correct answer is A: cellobiose: 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Biological molecules in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2011 examination, Paper 1 Variant 2.

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