obligate anaerobe

Obligate

[v. ob-li-geyt; adj. ob-li-git, -geyt]
Obligate could be:

  • A verb (see obligation)
  • An adjective meaning "by necessity" (antonym facultative) and used mostly in biology, especially in the phrases:
    • Obligate parasite, a parasite that cannot survive without its host
    • Obligate intracellular parasite, a parasitic microorganism that cannot reproduce outside their host cell
    • Obligate aerobe, an organism that cannot survive without oxygen
    • Obligate anaerobe, an organism that cannot survive in the presence of oxygen
    • Obligate air-breather, a complex organism which obtains required oxygen directly from the atmosphere through respiration rather than extracting dissolved oxygen from water, as, for example, the South American lungfish

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