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Protists

Chapter 28 Key Points. Protists. Protists are Highly Varied. Simplest Eukaryotes Most diverse kingdom Can be unicellular or multicellular Paraphyletic Under reorganization. Evolutionary History. Evolved from cyanobacteria Serial endosymbiosis Evidence: Separate DNA

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Protists

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  1. Chapter 28 Key Points Protists

  2. Protists are Highly Varied • Simplest Eukaryotes • Most diverse kingdom • Can be unicellular or multicellular • Paraphyletic • Under reorganization

  3. Evolutionary History • Evolved from cyanobacteria • Serial endosymbiosis • Evidence: • Separate DNA • Multiple membranes • Similar reproduction

  4. Endosymbiosis

  5. Three Primary Groups • Animal-like Protists • Ex: ciliates, euglenids, diplomonads • Plant-like Protists • Ex: algae • Fungus-like Protists • Ex: slime molds, water molds

  6. Animal-Like Protists • Heterotrophs • Mobile • Often cause disease • Sleeping sickness • Malaria • Chagas disease • Dysentery

  7. Malaria

  8. Plant-Like Protists • Autotrophs • Include largest protists (kelp) • Closest relatives of land plants • Used in food processing • Can cause “red tide”

  9. Fungus-Like Protists • Some produce fruiting bodies like fungi • Model for evolution of multicellularity • Often act as decomposers

  10. Plasmodium

  11. Fruiting Bodies

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