DP Biology (first assessment 2025)

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Question 19N.2.SL.TZ0.h

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.2.SL.TZ0.h
Level SL Paper 2 Time zone TZ0
Command term Discuss Question number h Adapted from N/A
h.
[Maximum mark: 3]
19N.2.SL.TZ0.h

Using all the data, discuss whether inoculating mice with the antigen to B. burgdorferi could be an effective method of controlling the spread of Lyme disease.

[3]

Markscheme

a. Site 2 suggests that vaccination could reduce «nymph» infection rate «so method might be effective» ✔

b. Site 1 suggests that vaccination does not reduce «nymph» infection rate «so method probably not effective» ✔

c. effective «to some extent» as vaccination increases antibodies/immunity in mice ✔

d. high antibody levels needed/ many mice need to be vaccinated «for the method to be effective» ✔

e. some nymphs are still infected / «absolute» numbers «rather than proportions» of infected nymphs are similar in those collected from control and vaccinated mice ✔

f. there are other hosts/mammals/birds ✔

g. difficult/expensive «to vaccinate many small mammals/mice»
OR
cheaper to use protective clothing/tick repellant/avoid wooded areas/other method ✔

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