IB Biology SL 3.2.10 Immunity after infection Question Bank
Practise IB Biology SL 3.2.10 by explaining how a previous infection changes the response to reinfection.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Describe how memory cells affect the response to a second infection.
- Explain why a later immune response can be faster or stronger.
C3.2.10—Immunity from memory cells question 1
A person was infected with a pathogen and then later in life they were re-infected with the same pathogen. The graph shows the concentration of antibodies found in the blood that were produced in response to these two infections.
Time / days
What is the reason for the faster rise in antibody concentration after the second infection?
A
The patient had previously been vaccinated with the antibody.
B
Antibodies had been stored after the first exposure.
C
Lymphocytes rapidly reproduced to form plasma cells.
D
The second exposure was more infectious.
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