A-LevelBiologyImmunity9700/12 · May/June 2012 · 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?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
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
B: Memory cells for this antigen are present in the body within 20 days.
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