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Beer is a difficult medium for most microorganisms because it combines

  • A.Alcohol, low pH, hop compounds and little oxygen
  • B.High sugar, neutral pH and abundant free oxygen
  • C.High salt, high temperature and abundant nutrients
  • D.Neutral pH, no alcohol and a rich supply of nitrogen

Answer: A

Several barriers act together, so the spoilage flora of beer is unusually narrow. Removing any single one, such as brewing a low-alcohol or lightly hopped beer, widens the range of organisms that can grow and raises the stability problem sharply.

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