01:119:116 Lecture Notes - Lecture 3: Anaerobic Respiration, Pseudopodia, Diatom
28 Jan 2018
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Well-developed cytoskeleton: network of fibers within cell **fig 6. 8 a. b. c. d. Provides support, allows for asymmetry (polarity), changing shape. Relationship between 2 species in which 1 lives inside the other. Serial endosymbiosis: series of endosymbiosis events - resulted in eukaryotic organelles. Primary endosymbiosis- phagocytosis of bacterium by larger cell. Mitochondria: aerobic bacterium within anaerobic cell (alpha proteobacteria archaea) All mitochondria descended from a single common ancestor. Plastid- general term for a group of closely related organelles. Led to 2 lineages of photosynthetic protists - red algae, green algae a. b. c. d. e. f. g. Occurred frequently in red and green algae, led to other lineages with plastids **fig 28. 3. Example: heterotrophic eukaryote ( with mitochondria) engulfs cyanobacteria ( 1o endosymbiosis) -> autotrophic eukaryote with chloroplasts or other plastids. No consensus on divergence from common ancestor - polytomy. Protist = "the very first" a. b. c. Representative of 1st eukaryotic cells, up to 1. 8 bya.
