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What is a Protist?

What is a Protist?. Unicellular or multicellular Microscopic or very large Heterotrophic or Autotrophic What do they have in common? All protists are eukaryotic , meaning they have membrane bound organelles. (like us!) Live in moist environments.
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What is a Protist?
  • Unicellular or multicellular
  • Microscopic or very large
  • Heterotrophic or Autotrophic
  • What do they have in common?
  • All protists are eukaryotic, meaning they have membrane bound organelles. (like us!)
  • Live in moist environments.
  • Categorized by their method of nutrition.
  • http://www.youtube.com/watch?v=SCfg3sywC7kAnimal-like Protists
  • Called protozoa (protozoan singular)
  • All protozoa are unicellular
  • Heterotrophic
  • Are grouped on how they move
  • Cilia (Ciliates)
  • Reproduce asexually and use its cilia, oral groove, gullet and food vacuoles in the process of digestion
  • Flagella (Flagellates)
  • African Sleeping sickness, help termites digest wood
  • Cytoplasm containing pseudopodia (Amoeboid)
  • Amoebas reproduce asexually and can form cysts in extreme conditions
  • One group causes disease called sporozoans
  • Most produce spores (a reproductive cell that forms without fertilization and produces a new organism)
  • Parasites
  • 300 Million people globally have Malaria
  • Examples:
  • Paramecium
  • Foraminiferans
  • Amoebas
  • http://www.youtube.com/watch?v=F_Xi3hnhtbgFungus-like ProtistsEwww.. we’re gross!Dude, I know.
  • Decompose dead organisms
  • Heterotrophic / Decomposers
  • Unlike Fungi…
  • Can move around during some point in their life
  • Do not have chitin in their cell walls
  • Examples:
  • Slime Molds
  • Water Molds
  • Downy Mildews
  • http://www.youtube.com/watch?v=9pNGhW9BiZEhttp://www.youtube.com/watch?v=0rNI8Bos_BQ&feature=relatedPlant-like Protists
  • Called algae (alga singular)
  • Do not have organs like roots, stems and leaves
  • Produce most of the Oxygen in the atmosphere and the basis for aquatic food chains.
  • Undergo the process of photosynthesis to make their own food (Autotrophic)
  • Note: Euglena can also be heterotrophic
  • Examples:
  • Euglena
  • Diatoms (silica shells)
  • Dinoflagellates (red tides)
  • Red, Brown, Green algae
  • Green algae were likely ancestral plants.
  • Plant-like Protists:Alternation of Generations
  • The life cycles of some algae and all plants have a pattern called alternation of generations.
  • Alternates between haploid and diploid generations
  • Haploid form is called the gametophyte because it produces gametes.
  • The gametes fuse to form a zygote which form the diploid part of the organism is called the sporophyte.
  • Eventually these cells become haploid spores that can develop into a new gametophyte.
  • http://biology.clc.uc.edu/courses/bio106/protista.htm
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