The diagram shows an antibody molecule with some parts labelled. [Diagram of an antibody molecule with parts P, W, V, U, R, S, T labelled] Which row is correct about the parts that form an antigen-binding site and have identical amino acid sequences?
✓ Correct Answer
The correct answer is C: form an antigen-binding site: R and S, have identical amino acid sequences: U and V
📋 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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