A-LevelBiologyImmunityFeb/Mar 2017Paper 1 Q401 Mark
Two people, G and H, were each given an injection to protect them against a particular pathogen. One person was injected with antibodies. The other person was injected with a vaccine. The graph shows the concentrations of the antibody against this pathogen in the blood of the two people, G and H, over a period of 20 days following the injection. Which row correctly describes the type of immunity shown by G and H? [Figure 40.1]
Aartificial active immunity artificial passive immunity
Bartificial passive immunity artificial active immunity
Cnatural active immunity natural passive immunity
Dnatural passive immunity artificial active immunity
✓ Correct Answer
The correct answer is B: artificial passive immunity artificial active immunity
📋 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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