A-LevelBiologyImmunityMay/June 2021Paper 1 Q401 Mark
A country introduced a measles vaccination during a measles epidemic. Later, it was realised that vaccinated children were more likely to survive childhood than unvaccinated children, even when there were no measles epidemics. The vaccine had given the children some protection against other pathogenic infections. Which statement could account for this extra protection?
AB-lymphocytes produced memory cells which gave the children passive immunity to these infections.
BMemory cells produced plasma cells which secreted anti-measles antibodies that bound to antigens that closely resembled measles antigens.
CMemory cells produced plasma cells which secreted anti-measles antibodies that bound to any antigen.
DT-lymphocytes produced memory cells which gave the children natural immunity against these other infections.
✓ 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...
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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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