Question 15
HA person was given two doses of a vaccine. The second dose was given 30 days after the first.
The Figure shows the concentration of antibodies in the person's blood.
Figure
a.[2]
Calculate the mean rate of increase in the concentration of antibodies between day 32 and day 36.
Give your answer in arbitrary units per day.
b.[3]
Explain why the concentration of antibodies increased faster and to a higher level after the second dose than after the first dose.
c.[2]
By day 70, the concentration of antibodies is falling.
Explain why the person is still protected against the pathogen.
5.3 Immune system and medicines Questions
45 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.