Organisms can be categorized based on whether that organism can use oxygen as electron acceptor or not in energy production. Those who can use oxygen are called aerobes and those who cannot are called anaerobes. Some species are facultative anaerobes. They can substitute their electron acceptor in anaerobic conditions.

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Chapter 17, Problem 18P

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Organisms can be categorized based on whether that organism can use oxygen as electron acceptor or not in energy production. Those who can use oxygen are called aerobes and those who cannot are called anaerobes. Some species are facultative anaerobes. They can substitute their electron acceptor in anaerobic conditions.

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