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smokeyjou smokeyjou
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12 years ago
Know what the serial endosymbiotic theory is - how does this explain the origin of mitochondria and chloroplasts?

How is this different than the origin model for the components of the eukaryotic endomembrane system?

I know what the serial endosymbiotic theroy is and I think I understand why it explains the origin of mitochondria and chloroplasts, but I really do not understand the second question.
Thanks!
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12 years ago
endosymbiotic theory is that a prokaryote ate another prokayote (endocytosis, so it the eaten one stayed membrane-bound in a vesicle). this either became the chloroplast or mitochondrion, depending on what prokaryote got eaten. also explains the double membrane.
http://en.wikipedia.org/wiki/Eukaryote

i've never heard of "the origin model," but from what i've heard there's another little theory that a prokaryote one day just up and developed a nucleus all on its own, and just sorta got more and more advanced within itself making lipids, carbs, proteins, other organelles, etc.

as for the endomembrane system, it seems to be that some cells were hanging out with each other and helping each other out with their daily activities, and eventually they won the natural selection battle as a team rather than dying out like those cells that worked alone.
http://en.wikipedia.org/wiki/Endomembrane_system
http://www.mcb.arizona.edu/hewlett/mjhusfpaper.html
 (for this one do ctrl+F and type endomembrane...it'll take you to the part of the page where he talks about it a little)

hope this helps!
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