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Discussion

Hydrogen sulfide in spoiling fish arises from bacterial metabolism of

  • A.starch stored in the muscle
  • B.oil held in the tissue
  • C.sulfur-containing amino acids
  • D.trimethylamine oxide alone

Answer: C

Shewanella putrefaciens degrades sulfur-containing amino acids and proteins to hydrogen sulfide, which is considered a main source of fishy odour alongside trimethylamine. The two products together account for most of what the nose detects in spoiled fish.

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