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Domain Eukarya

Domain Eukarya. Kingdom Protista. What is a protist ?. What is a protist ?. Weird things: has eukaryotic cells, so they aren’t bacteria or archaea doesn’t fit in with the fungi, plants, or animals either

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Domain Eukarya

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  1. Domain Eukarya Kingdom Protista

  2. What is a protist?

  3. What is a protist? • Weird things: • has eukaryotic cells, so they aren’t bacteria or archaea • doesn’t fit in with the fungi, plants, or animals either • this kingdom is a ‘catch-all’ for things that we don’t fully understand their relationships to the rest of life

  4. How do we group protists? • Very diverse, so we tend to think of them as which other kingdom they are most like: • fungus-like • plant-like (algae and seaweeds) • animal-like (protozoans)

  5. Fungus-like protists • not classified as fungi for various reasons • have a stage in their life cycle where they are mobile • sometimes unicellular, sometimes multicellular • most reproduce using spores

  6. Fungus-like protists • Two main groups (thought there are more) • Slime molds • Water molds • Mostly heterotrophic decomposers

  7. Fungus-like protists • Many water molds are parasitic and cause numerous plant diseases, among other things Sudden Oak Death

  8. Plant-like protists • probably the most familiar protists; include algae and seaweed • not classified as plants due to various reasons: • some are unicellular • some lack certain tissues that true plants have • must live in water

  9. Plant-like protists • use photosynthesis to obtain food • many different groups: • diatoms • euglena • green, red, brown, and golden-brown algae

  10. Plant-like protists • Uses: • Diatoms are used in forensics, nanotechnology, and agriculture • Seaweeds are an important source of food and have applications in green energy

  11. Animal-like protists • again, not classified as animals for a variety of reasons: • mostly unicellular • mostly heterotrophs that live in water

  12. Animal-like protists • often grouped by how they move: • flagellates (move using a flagella) • ciliates (move by using cilia) • amoebas (move using pseudopodia) • there is an additional group that is entirely parasitic: • sporozoans Giardialamblia Plasmodium Paramecium Amoeba

  13. Animal-like protists • Relevance to people: • disease: giardiasis, malaria, Chagas disease • scientific research: Paramecium is used as a model organism in labs • ecological: many eat bacteria, helping keep their numbers in check

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