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Protists

Protists. The world of Protists: Animal-like Protists Plant-like Protists Fungus-like Protists. Protist Diversity. 200,000 species come in different shapes, sizes, and colors All are eukaryotes – have a nucleus and membrane-bound organelles Reproduce sexually or asexually. Protozoans.

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Protists

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  1. Protists The world of Protists: Animal-like Protists Plant-like Protists Fungus-like Protists

  2. Protist Diversity • 200,000 species come in different shapes, sizes, and colors • All are eukaryotes – have a nucleus and membrane-bound organelles • Reproduce sexually or asexually

  3. Protozoans Animal-like Protists

  4. Protozoans • Unicellular – made up of one cell • Heterotrophs– they eat other organisms or dead organic matter • Classified by how they move

  5. Phyla of Protozoans Amoebas Flagellates Ciliates Sporazoans

  6. Amoebas: the blobs • No cell wall • Move using pseudopods – plasma extensions or “fake feet” • Engulf bits of food by flowing around and over them

  7. Flagellates: the motorboats • Use a flagella – a whip like tailto move • Some cause diseases

  8. Trichomonas foetus : cow disease

  9. Trichomonas vaginalis: an STD

  10. Ciliates: the hairy ones • Move with cilia – tiny beating hairs

  11. Sporazoans: the parasite • Non-motile - Do not move • Live inside a host • One type causes malaria

  12. Malaria in red blood cells

  13. Pneumonia in aids patients

  14. Algae Plantlike Protists

  15. What are Algae? • Multicellular (Colony only)– made of more than one cell • Photosynthetic – make their own food • No roots, stems, or leaves • Each has chlorophylland other photosynthetic pigments

  16. Phyla of Algae Euglenoids Diatoms Dinoflagellates Red, Brown, & Green Algae

  17. Euglenoids: The Survivors • Aquatic • Move around like animals • Can ingest food from surroundings when light is not available

  18. Diatoms: The Golden Ones • Have shells made of silica (glass) • Photosynthetic pigment called carotenoids – give them a golden color

  19. Dinoflagellates: The Spinning Ones • Spin around using two flagella • Responsible for Red Tides • Create toxins that can kill animals and sometimes people

  20. Red Algae: The…uh…Red Ones (duh) • Seaweeds • Multicellular, marine organisms • Have red and blue pigments

  21. Brown Algae: The Brown Ones (You think?) • They have air bladders to help them float at the surface – where the light is.

  22. Green Algae: Yeah, You Guessed it, The Green Ones • Most live in fresh water • Can be unicellular or multicellular • Live alone or in groups called colonies

  23. Fungus-like Protists

  24. Characteristics in Common • All form delicate, netlike structures on the surface of their food source, mold-like • Obtain energy by decomposing organic material

  25. PhylaofFungus-like Protists Plasmodium Slime Molds Cellular Slime Molds Water Molds & Downy Mildews

  26. Slime Molds • Live in cool moist, shady places where they grow on damp, organic matter

  27. Plasmodium Slime Molds • Form plasmodium: a mass of cytoplasm that contains many diploid nuclei but no cell walls or membranes – its feeding stage • Creeps by amoeboid movement – 2.5 cm/hour

  28. Plasmodium continued… • May reach more than a meter in diameter • Form reproductive structures when surroundings dry up • Spores are dispersed by the wind and grow into new plasmodium

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