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IB Biology SL 3.2.16 Vaccines and immunization Question Bank

Practise IB Biology SL 3.2.16 by explaining how vaccination creates memory cells and interpreting antibody responses after exposure.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how vaccination produces memory cells and a faster antibody response after later exposure to a pathogen.
  • Interpret antibody graphs to identify prior infection, vaccination and primary or secondary immune responses.

C3.2.16—Vaccines and immunization question 1

[Maximum number: 2]

The image shows a castor bean tick (Ixodes ricinus) which is commonly found in woodlands or forest areas. This tick can carry bacteria that cause Lyme disease in humans.

Figure for Question C3.2.16—Vaccines and immunization question 1 — IB Biology SL

Question (a)

(a)

A vaccine has been developed to protect people against the symptoms of Lyme disease.
The graph shows the relative number of antibodies specific to these bacteria in the blood of a person before vaccination.

Figure for Question (a) — IB Biology SL
[ 2 ]

Question (i)

(i)

Suggest what can be concluded from the graph about the person before they were vaccinated.

[ 1 ]

Question (ii)

(ii)

Sketch a line on the graph to show how the number of antibodies would change over time after vaccination.

[ 1 ]
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