Bergey'S Manual Describes Streptococcus

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Bergey'S Manual Describes Streptococcus

and Escherichia as facultative anaerobes. How do oxygen requirements of these organisms differ? Which one could correctly be called an aerotolerant anaerobe?
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Streptococcus is strictly fermentative. Lacks an electron transport chain. Escherichia can grow anaerobically by fermentation and aerobically by using oxygen as the final electron acceptor in respiration. Streptococcus could be correctly called an aerotolerant anaerobe.

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