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The lactic acid bacteria that spoil beer are notable for being

  • A.Killed instantly by the carbon dioxide present
  • B.Resistant to the antibacterial compounds of hops
  • C.Unable to grow at any pH below neutrality
  • D.Dependent on a plentiful supply of oxygen

Answer: B

Hop resins inhibit most Gram-positive bacteria, so the strains of Lactobacillus and Pediococcus that trouble brewers are precisely those that have acquired hop resistance. This is why hop rate influences which spoilage organisms matter.

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