A-LevelBiologyBiological moleculesOct/Nov 2017Paper 1 Q101 Mark
The diagram shows the structure of the polysaccharide chitin which is found in the cell wall of fungi. [Figure 10.1 - molecular diagram of chitin structure] Which statements are correct for chitin and for cellulose? 1 The monomers are joined by 1,4 glycosidic bonds. 2 Every second monosaccharide in the polysaccharide chain is rotated by 180°. 3 The polysaccharide contains the elements carbon, hydrogen, oxygen and nitrogen.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct Answer
The correct answer is B: 1 and 2 only
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep