DP Biology (first assessment 2025)

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Question 22N.1A.HL.TZ0.23

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.HL.TZ0.23
Level HL Paper 1A Time zone TZ0
Command term Question number 23 Adapted from N/A
23.
[Maximum mark: 1]
22N.1A.HL.TZ0.23

Some vaccinations, such as the smallpox vaccine, provide lifelong immunity against the disease. For others, such as tetanus, this immunity lasts for a shorter period of time. Why is a tetanus booster vaccination recommended every 10 years?

A.  Antibodies that formed after the first vaccination persist in the blood for up to 10 years.

B.  Memory cells are not produced after the first vaccination.

C.  Only non-specific immunity is stimulated after the first vaccination.

D.  Memory cells gradually decline over 10 years.

[1]

Markscheme

D

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