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Protists

Domain Archaebacteria. Domain Eukaryotes. Domain Bacteria. Common ancestor. Protists. Simply Eukaryotes. General characteristics. Classification criteria eukaryotes not animal, plant or fungi. That’s more of what they’re not & not what they are !. Protist Diversity.

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Protists

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  1. Domain Archaebacteria Domain Eukaryotes Domain Bacteria Common ancestor Protists Simply Eukaryotes

  2. General characteristics • Classification criteria • eukaryotes • not animal, plant or fungi That’s more ofwhat they’re not& notwhat they are!

  3. Protist Diversity • A great variety in ways of life • one-celled to many-celled • ______________________________________________________________________ • asexual to sexual reproduction • pathogens to beneficial • sessile to mobile

  4. Mobility • How Protists move • flagellum • cilia • pseudopod

  5. Paramecium with food vacuoles stained red Amoeba ingesting a Paramecium Protist Diversity • Animal-like Protists • ____________________ • Amoeba • Paramecium • Stentor

  6. Protist Diversity • Plant-like Protists • _________________________ • Euglena • algae • diatoms

  7. Protist Diversity • Parasitic & pathogen Protists • malaria • Giardia • trypanosomes Plasmodium Giardia Trypanosoma

  8. Protist Diversity • Beneficial & necessary Protists • ______________________ • small algae + diatoms • much of the world’s photosynthesis • produces ~90% of atmospheric oxygen • ______________________ • heterotroph protists • key ecological role at base of marine food web Mmmmmm!Keeps me goin’!

  9. Any Questions??

  10. Any Questions??

  11. Why is a hugesingle-celledcreature notpossible?

  12. Great Diversity brown algae& diatoms dinoflagellates & ciliates green algae euglenoids red algae miscellaneous?

  13. Streptophyta (includes land plants) Choanoflagellida Archaea Chlorophyta Animals Bacteria Stramenopila Euglenozoa Fungi Alveolata Rhodophyta Problems with Protist Classification • Too Diverse!

  14. Paramecium & symbiont Chlorella Theory of Endosymbiosis mitochondrion internal membrane system aerobic bacterium Eukaryotic cell with mitochondrion Ancestral eukaryotic cell photosyntheticbacterium chloroplast Eukaryotic cell with chloroplasts

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