A-LevelBiologyBiological moleculesMay/June 2012Paper 1 Q111 Mark
The diagram shows two molecules of glucose. Four possible bonding positions are labelled p, q, r, and s, and t, u, v, w. [Figure 11.1] When these two molecules condense during the formation of a glycogen molecule, where could bonds form?
Ap – u or q – w
Bq – w or p – v
Cr – t or q – u
Ds – w or r – v
✓ Correct Answer
The correct answer is A: p – u or q – w
📋 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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