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Date May 2017 Marks available 1 Reference code 17M.1.SL.TZ1.20
Level Standard level Paper Paper 1 Time zone Time zone 1
Command term Question number 20 Adapted from N/A

Question

A bacterial population with no resistance to an antibiotic may develop into a bacterial population with some resistance to an antibiotic. Which event could lead to this?

A. Antibiotic resistance was inherited from an ancestral population.

B. An antibiotic resistance plasmid is received from a bacterium in another population.

C. The enzyme needed for antibiotic resistance is received from a bacterium in another population.

D. The bacterial population mutated in response to antibiotics in the environment.

Markscheme

B

Examiners report

[N/A]

Syllabus sections

Core » Topic 5: Evolution and biodiversity » 5.2 Natural selection
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Core » Topic 5: Evolution and biodiversity
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