Discussion
Which of the following bacteria can grow in acidic pH?
Answer: B
Correct answer: Lactobacilli
Lactobacilli are acidophilic: they ferment sugars to lactic acid and tolerate the acidity they create, growing well below pH 5. That is what makes them the organisms of yoghurt, cheese and pickles - the acid preserves the food by excluding everything else. Vibrio cholerae is the opposite case, preferring alkaline conditions.
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