Biology Professor (Twitter: @DrWhitneyHolden) describes the 5 classifications of bacteria based on oxygen preferences, including obligate aerobes, facultative anaerobes, obligate anaerobes, aerotolerant anaerobes, and microaerophiles. Examples are given of each class of bacteria, including several human pathogens, and the video also includes a discussion of why some bacteria can tolerate oxygen and some can't (Hint: superoxide dismutase, catalase, and peroxidae!) Great for MCAT Biology Review! For more information on how bacteria can be classified by temperature preferences, see Biology Professor's video: [ Ссылка ]

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