Tetrathionate Broth Is an Enrichment Medium

question 5

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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Definitions:

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The process by which kidneys filter blood, remove waste products and excess substances, and excrete them as urine.

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