A-LevelBiologyImmunityMay/June 2019Paper 1 Q401 Mark
The diagrams show three different types of antibody structure. [Figure: Diagrams of IgG, IgA, IgM antibody structures] Which row is correct?
AIgG: one binding site for an antigen molecule, IgA: two light chains, IgM: two heavy chains
BIgG: two heavy chains, IgA: four binding sites for antigen molecules, IgM: five hinge regions
CIgG: two hinge regions, IgA: four heavy chains, IgM: five light chains
DIgG: two light chains, IgA: four hinge regions, IgM: ten binding sites for antigen molecules
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of immunity within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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