01:119:116 Quiz: Protists
31 Mar 2016
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Document Summary
Well developed cytoskeleton: network of fibers within cell. Evolution of eukaryotes: endosymbiosis: relationship between 2 species in which 1 lives inside the other, common in evolutionary history, serial endosymbiosis: theory that eukaryotic organelles evolved through a sequence of endosymbiotic events. Primary endosymbiosis: phagocytosis of bacterium by larger cell, mitochondria: aerobic bacterium (alpha proteobacteria) within anaerobic cell (archaea, all mitochondria descended from a single common ancestor arose just once, cyanobacteria engulfed chloroplasts. Plastid evolution: plastid general term for a group of closely related organelles (ex: chloroplasts, chromoplasts, and amyloplasts, found in photosynthetic eukaryotes, host that led to plastids was a heterotrophic eukaryote, let to 2 different lineages of photosynthetic protists. Secondary endosymbiosis: host cell from primary endosymbiosis engulfed, occurred frequently in red and green algae. Eukaryotic evolution: new data rapidly changing hypothesis, not clear on what the true phylogemy is, 4 supergroups (grouped on molecular evidence and named because of the features of some the members of each group)
