Endosymbiotic Theory

The Endosymbiotic Theory The endosymbiotic theory is the idea that a long time ago, prokaryotic cells ate other prokaryotic cells. This resulted in the first eukaryotic cells.

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