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Endosymbiotic
Theory
Endosymbiotic Theory
• Page 427
• Proposes that eukaryotic (have nuclei) cells
arose from living communities formed by
prokaryotic (no nuclei) organisms.
Endosymbiotic Theory
• Would you consider cells to be simple or
complex?
• How did cells become so complex?
• Endo = within
• Symbiosis = 2 organisms living together
• Mitochondria & Chloroplasts are very similar
to prokaryotic bacteria
– DNA
– Ribosomes
– Reproduce by binary fission
– 2 membranes
• What does endosymbiosis mean?
Endosymbiotic Theory
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