A-LevelBiologyInfectious diseasesOct/Nov 2019Paper 2 Q514 Marks
Influenza is an infectious disease caused by the influenza A virus. This virus causes influenza in birds and mammals. Fig. 5.1 is a diagram of an influenza A virus. Haemagglutinin allows the virus to attach to host cells by binding to receptors on the cell surface membrane of the host cells. Neuraminidase is an enzyme that helps the virus to leave host cells after the virus has replicated.
📋 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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