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A facultative anaerobe is an organism that ________.

  • A.grows only in the presence of oxygen
  • B.grows only in the absence of oxygen
  • C.grows with or without oxygen, but better with it
  • D.requires a reduced concentration of oxygen

Answer: B

Correct answer: grows with or without oxygen, but better with it

A facultative anaerobe respires aerobically when oxygen is present and switches to fermentation or anaerobic respiration when it is not. Escherichia coli is the standard example, and in a thioglycolate tube such organisms grow throughout while clustering near the top.

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