01:119:116 Lecture Notes - Lecture 3: African Trypanosomiasis, Giardia Lamblia, Red Algae
22 Apr 2016
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Document Summary
Endosymbiosis: relationship between two species win which organism lives inside other organisms. Throughout evolutionary history one organism has engulfed another to mutual benefit of both. Serial endosymbiosis: proposes key eukaryotic organelles evolved through sequence of endosymbiotic events. Phagocytosis of a bacterium by another cell: 2 key eukaryotic organelles. Mitochondria of all eukaryotes descended from 1 ca. Mitochondria arose only once over course of evolution. Group of closely related organelles of photosynthetic eukaryotes. Found in cells host was heterotrophic eukaryote. Lineage gave rise to two lineages of photosynthetic protists: red algae and green algae. Host cell from primary endosymbiosis engulfed by another cell. Red and green algae underwent secondary symbiosis occurred frequently. Protists are eukaryotic cells have organelles and are more complex than prokaryotic cells. Changes shape as the cell moves, feeds, and grows. Huge eukaryotic diversity new data and rapidly changing hypotheses. Root of eukaryotic tree not known: 4 supergroups diverging simultaneously from one common ancestor.
