Tetrathionate Broth Is an Enrichment Medium

question 53

Multiple Choice

Tetrathionate broth is an enrichment medium. Initially, when a mixed bacterial stool sample is inoculated into this medium, the bacteria respire aerobically. Once O₂ is depleted, most bacteria switch to fermentation in order to continue growth. However, Salmonella can use the tetrathionate in this medium as a terminal electron acceptor, so can grow anaerobically. Why does this give the bacteria a competitive advantage over other bacteria in the sample?

• A) Tetrathionate inhibits the growth of fermenters.
• B) Fermentation yields more ATP than aerobic respiration.
• C) Anaerobic respiration yields more ATP than aerobic respiration.
• D) Anaerobic respiration yields more ATP than fermentation.
• E) Tetrathionate yields more ATP than glucose.

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