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Question 18M.2.SL.TZ1.b

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Date May 2018 Marks available [Maximum mark: 4] Reference code 18M.2.SL.TZ1.b
Level SL Paper 2 Time zone TZ1
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 4]
18M.2.SL.TZ1.b

Explain how antibiotic resistance can evolve in bacteria, such as those causing pneumonia.

[4]

Markscheme

a. antibiotic resistance exists as a genetic variation (within the population) 

b. (antibiotic resistance) may occur from transfer of genetic material
OR
(antibiotic resistance) may occur through mutation 

c. resistance is specific to one antibiotic 

d. only bacteria with resistance gene reproduce in the presence of antibiotic 

e. frequency of resistant bacteria increases in population 

f. resistant population replaces non-resistant over time

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