Chapter 28 Lecture - Protists and the Dawn of Eukarya...

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Protists and the Dawn of Protists and the Dawn of Eukarya Eukarya
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The Protists The Protists
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TANUJA SHARMA TANUJA SHARMA Mon 6-6:50 BO2047 TUES. 1-1:50 SA1080 TH. 1-1:50 BO2047
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The Origin of Eukaryotic The Origin of Eukaryotic Cells Cells The evolution of eukaryotic cells occurred in several steps.
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Ribosome Protective cell wall DNA Developing flagellum Actin Microtubules Lysosome Peroxisome Mitochondrion Chloroplast Loss of cell wall. Infolding increased surface area for absorption of nutrients. Internal membranes studded with ribosomes formed. As DNA attached to the membrane of an infolded vesicle, a precursor of a nucleus formed. A eukaryotic flagellum formed, enabling propulsion. Digestive vesicles evolved into lysosomes. Peroxisomes may have formed through endocytosis. Mitochondria formed through endocytosis, enabling generation of ATP. Endocytosis of a cyanobacterium led to the development of chloroplasts.
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