May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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40Immune System DefencesMedium1 mark
The graph shows the concentration of antibodies produced in response to an antigen.
Graph of antibody concentration in the blood (y-axis, no scale marked) against time in days (x-axis, 0 to 40) following first exposure to an antigen (marked with an arrow at day 0): the curve stays near zero until about day 5, rises to a small peak around day 12-13, falls back down by about day 20, then rises steeply to a much higher, broader peak between about day 30 and 38.
Which statement is correct?