Escherichia coli is a chemoorganotrophic, facultative aerobe and belongs to the phylum Proteobacteria. Based on this information, which of the following functional groups does E. coli most likely belong to?

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E. coli is a facultative aerobe, meaning it can switch between aerobic respiration and anaerobic processes such as fermentation or anaerobic respiration. Among the options, denitrifying bacteria are capable of anaerobic respiration, converting nitrates into nitrogen gas under oxygen-limited conditions, which aligns with the facultative aerobic nature of E. coli.

Escherichia Coli Is a Chemoorganotrophic, Facultative Aerobe and Belongs to the Phylum