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Cambridge IGCSE Biology practice

What is the main reason antibiotic-resistant bacteria become more common after antibiotic treatment?

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Selection

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What is the main reason antibiotic-resistant bacteria become more common after antibiotic treatment?.

  1. A.Antibiotics cause bacteria to mutate.
  2. B.Resistant bacteria survive and reproduce.
  3. C.All bacteria become resistant.
  4. D.Antibiotics create new bacteria.

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Paper 4Theory (Extended)2 marks

Description

Antibiotic Resistance

When antibiotics are used, most bacteria are killed, but some bacteria with mutations that confer resistance survive and reproduce. Over time, the population of bacteria becomes dominated by resistant strains.

  1. a

    Describe how antibiotic-resistant bacterial strains emerge as a result of natural selection.

    Aim for approximately 2 distinct marking points.

    [2]