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Hop compounds contribute to the microbiological stability of beer because they

  • A.Kill every organism able to enter the beer
  • B.Raise the pH of the beer towards neutral
  • C.Supply nutrients that yeast alone can use
  • D.Inhibit many Gram-positive bacteria

Answer: D

Iso-alpha acids from hops are antibacterial against many Gram-positive organisms, which is one reason the spoilage flora of beer is narrow. The organisms that do spoil beer, notably certain Lactobacillus and Pediococcus strains, are precisely those that have become hop resistant.

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