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Endosymbiotic Theory

Endosymbiotic Theory. p. 427-428. The Endosymbiotic Theory. Review: What is a theory? What is the difference between prokaryotic and eukaryotic cells?

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Endosymbiotic Theory

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  1. Endosymbiotic Theory p. 427-428

  2. The Endosymbiotic Theory • Review: • What is a theory? • What is the difference between prokaryotic and eukaryotic cells? • The endosymbiotic theory is the idea that a long time ago, prokaryotic cells engulfed other prokaryotic cells by endocytosis. This resulted in the first eukaryotic cells. • First proposed by Lynn Margulis • Explains the origin of eukaryotic cells • Explains the origin of certain membrane-bound organelles

  3. What Exactly Happened? Chloroplast Plants and plant-like protists Ancient Prokaryotes Heterotrophic bacteria Photosynthetic bacteria Nuclear envelope evolving Mitochondrion Primitive Autotrophic (Photosynthetic) Eukaryote Animals, fungi, and animal-like protists Ancient Heterotrophic Prokaryote Primitive Heterotrophic Eukaryote

  4. Membrane-Bound Organelles • Mitochondria = membrane-bound organelle that produces energy for the cell • Chloroplast = membrane-bound organelle that captures sunlight and uses it to make food for the cell

  5. Evidence in support of the endosymbiotic theory: • Similarities between mitochondria, chloroplasts, & prokaryotes: • Circular DNA • Ribosomes • Binary fission

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