Endosymbiotic Theory

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

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

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

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

Check these out: Animation: http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter4/animation_-_endosymbiosis.html Student form with fill-in’s: Worksheet Notes\ENDOSYMBIOSIS student fill-ins.docx