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IB Biology SL C3.2.10 Immunity From Memory Cells Questions

Explore how persistent antigen-specific memory cells produce a faster and stronger response when the same pathogen is encountered again in IB Biology SL C3.2.10.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain that memory B- and T-cells remain after the primary response and retain antigen-specific information.
  • Compare primary and secondary responses: re-exposure activates memory cells to produce a faster and stronger antibody or T-cell response.

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Study C3.2.10—Immunity from memory cells conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL C3.2.10 Immunity From Memory Cells Questions question 1

[Maximum number: 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.

Figure for Question IB Biology SL C3.2.10 Immunity From Memory Cells Questions question 1 — IB Biology SL

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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