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RE: Where would I ask this question?
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]On Behalf Of
> Dora Smith
> This question is off topic here, but I am wondering if there is a list where
> they consider such matters.
> I want to know if all currently existing life forms on earth have
> mitochondria, or only those that metabolize oxygen for energy? For
> instance, do bacteria that metabolize sulfur or rock have mitochondria?
Do a web search on "endosymbiosis".
Mitochondria are by no means found in all life, nor even in all eukaryotes.
They are limited to most eukaryotes, including all the
multicellular forms (plants, animals, fungi, and various multicellular algae).
See http://www.tolweb.org/Eukaryotes/3 and especially
Mitochondria are themselves the descendants of once free-living
alpha-proteobacteria. Genomically, their closest known living
relatives are the species of _Rickettsia_, the bacterium that causes the
diseases spotted fever and typhus!
Thomas R. Holtz, Jr.
Senior Lecturer, Vertebrate Paleontology
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
Building 237, Room 1117
College Park, MD 20742
Phone: 301-405-4084 Email: email@example.com
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796