Discussion
Trimethylamine oxide in fish serves spoilage bacteria as
Answer: C
Correct answer: a terminal electron acceptor
Marine fish carry trimethylamine oxide as an osmolyte, and spoilage bacteria such as Shewanella respire on it when oxygen runs short, reducing it to trimethylamine. That is why marine fish develop the characteristic fishy ammoniacal smell and freshwater fish, which contain far less of the oxide, do not.
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