Antibiotic resistance spreads in a population of bacteria because

  1. all bacteria die
  2. antibiotics cause bacteria to become resistant deliberately
  3. resistant bacteria survive and reproduce when the antibiotic is used
  4. viruses carry resistance
Answer

C) resistant bacteria survive and reproduce when the antibiotic is used

Selection favours resistant mutants. AS & A Level Biology · Topic 10 Infectious Diseases · 10.2 Antibiotics

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