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Eukaryotes Unicellular or multicellular Very varied group

Kingdom Protista. Eukaryotes Unicellular or multicellular Very varied group. Origin and Diversity. Probably formed by cells taking in prokaryotic cells and keeping them as organelles Ex – mitochondria andchloroplasts were probably monerans that were captured .

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Eukaryotes Unicellular or multicellular Very varied group

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  1. Kingdom Protista Eukaryotes Unicellular or multicellular Very varied group

  2. Origin and Diversity • Probably formed by cells taking in prokaryotic cells and keeping them as organelles • Ex – mitochondria andchloroplasts were probably monerans that were captured

  3. Colonies formed before multicellular Protists • Once cells were growing together, they eventually developed specialized functions. • These eventually became attached and relied on each other for those functions. (Kind of like people who live in groups – they become specialized and begin to rely on each other.

  4. Protists are conveniently divided into three groups • Animal-Like Protists • heterotrophs • Plant-Like Protists • autotrophs • Fungus-Like Protists • Decomposers (heterotrophs that eat dead organic matter)

  5. Animal-like protists • Often called protozoans • Unicellular and don’t have specialized tissues, organs or organ systems.

  6. Animal-like protists - Sarcodines • Amoebas – move using pseudopods

  7. Amoeba

  8. Animal-like protists-Zooflagellates • Move using flagella

  9. Animal-like protists - ciliophorans These are cilia • Move using cilia • These are paramecia This is its oral groove

  10. Here is a paramecium dividing by binary fission

  11. Paramecium structure Oral groove

  12. Animal-like protists – sporozoans –always parasites and no way to move on their own • Plasmodium is a parasite that you get from a mosquito bite. The disease it causes is malaria, which kills about 3 million people a year around the world. It lives in your red blood cells and destroys them.

  13. Plant-Like protists - algae • Autotrophic – by photosynthesis • Commonly called algae or seaweed • Unicellular or multicellular

  14. Unicellular algae • Food for other organisms • Dinoflagellates cause red tides and some other harmful algae blooms in the oceans.

  15. Diatoms – live in glass cases diatoms

  16. Diatoms – in fresh and salt water Bottom of food chain Case made of silica (glass-like) Used for abrasives and filters

  17. euglenoids euglenoids

  18. euglena

  19. Multicellular algae Volvox – colony of Flagellated single cells • almost multicellular

  20. Green algae Predominant pigment is chlorophyll Found in all types of water

  21. Red algae • Grow in warm salt water • Some grow very deep in the ocean or on ice

  22. Brown algae • Mostly saltwater • Grow in cool salt water • Includes largest Protists

  23. Fungus-like protists • Slime molds – creep along in an amoeba-like fashion

  24. Protists in the Biosphere • Some cause disease • Red tide • African sleeping sickness • Giardia • Potato blight • Malaria

  25. Good uses of protists Plankton – bottom of the food chain Food – carageenan, agar, algin – thickeners and flavor enhancers Seaweed as food Diatoms for filters and as abrasives Indicators of the general health of the environment

  26. The end

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