Anaerobic respiration

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E. coli use anaerobic respiration

Anaerobic respiration is a form of respiration, where oxygen is not used as a form of electron transport. Common replacements for oxygen are nitrates, iron, manganese, sulfates, sulfur, fumaric acid and carbon dioxide. Escherichia coli use nitrates and fumaric acid for respiration.

If oxygen is not used at all, the process is called fermentation. Examples of organisms using fermentation are Lactic acid bacteria, and yeast. Yeast are fungi, not bacteria.