Obligate anaerobes are usually poisoned by molecular oxygen but may grow in aerobic habitats if associated with facultative anaerobes that use up all available oxygen.

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Obligate anaerobes require anaerobic conditions to grow and are typically poisoned by the presence of oxygen. However, if they are in a mixed culture with facultative anaerobes, the facultative anaerobes will consume the available oxygen, creating an environment suitable for the growth of the obligate anaerobes.

Obligate Anaerobes Are Usually Poisoned by Molecular Oxygen but May