A-LevelBiologyImmunityMay/June 2012Paper 1 Q351 Mark
The graph shows the amount of antibody produced in response to an antigen. [Figure 35.1] From the graph, which statement is correct?
AIt takes 25 days to achieve active immunity.
BMemory cells for this antigen are present in the body within 20 days.
CT-helper lymphocytes are activated on day 12.
DThe second exposure to the antigen occurred on day 25.
✓ 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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