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Protists

Protists. Protist Characteristics. Live in water Eukaryotic Most are unicellular , some are multicellular ( algae ). Protist Characteristics. Some are autotrophic (can make own food); some are heterotrophic (cannot make own food). Photosynthetic euglena.

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Protists

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  1. Protists

  2. Protist Characteristics • Live in water • Eukaryotic • Most are unicellular, some are multicellular (algae)

  3. Protist Characteristics • Some are autotrophic (can make own food); some are heterotrophic (cannot make own food) Photosynthetic euglena Amoeba eating paramecium (other protist)

  4. Protist Characteristics • All can reproduce asexually (by mitosis or binary fission); some are capable of sexual reproduction (by conjugation) (Remember the different methods of asexual & sexual reproduction?)

  5. Sexual or Asexual? conjugation Binary fission

  6. Protist Characteristics • Some have cells with contractile vacuole that help maintain homeostasis (can hold and expel fluid)

  7. Protists can be: • Animal-like (protozoa) – absorb or gather/capture food • Flagellates (or zooflagellates)- move by flagella • Examples: ones that live in termite intestines, ones that cause African Sleeping Sickness

  8. African Sleeping Sickness 2. The protist multiplies among red blood cells, and spreads throughout the body via the bloodstream. 1. Tsetse fly carries the parasitic protist inside, and infects the host when it bites, allowing the protist into the bloodstream.

  9. More Animal-like Protists • Sarcodines- uses pseudopods to move and capture prey • Example: amoeba (pseudo means “false”, pod means “foot”) http://micro.magnet.fsu.edu/moviegallery/pondscum/protozoa/amoeba/index.html Brain-Eating Amoeba! http://www.foxnews.com/story/0,2933,399262,00.html

  10. More Animal-like Protists • http://micro.magnet.fsu.edu/moviegallery/pondscum/protozoa/paramecium/index.html • Ciliates- move/eat by cilia, has oral groove and anal pore • Example: paramecium

  11. More Animal-like Protists • Sporozoans- parasitic, reproduces by spores • Example: plasmodium (causes malaria) Plasmodium falciparum is carried by mosquitos, and injected into the host when they bite.

  12. Protists can be: • Plant-like (algae)- contain chlorophyll and are photosynthetic • Euglena- can make and consume food http://micro.magnet.fsu.edu/moviegallery/pondscum/protozoa/euglena/rostrifera/index.html

  13. More Plant-like Protists • Diatoms- various shapes, cell walls of silicon, are used in toothpaste and scouring products

  14. More Plant-like Protists • Dinoflagellates- have flagella; one example causes red tides Pfiesteria piscicida causes red tides and fish kills

  15. More Plant-like Protists • Multicellular algae- green, brown, red

  16. Protists can be: • Fungus-like- cell walls, absorb nutrients, reproduce by spores • Slime molds • Watermolds • Example: Phytophthora infestans cause of potato famine in Ireland (1845 – 1852)

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