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Kingdom Protista. Packet #66 Chapter #28. Characteristics. Unicellular, or simple multicellular eukaryotes Heterotrophic or autotrophic Most are aquatic and may compose plankton Reproduction ranges from asexual to sexual modes HW Syngamy

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kingdom protista

Kingdom Protista

Packet #66

Chapter #28

characteristics
Characteristics
  • Unicellular, or simple multicellular eukaryotes
  • Heterotrophic or autotrophic
  • Most are aquatic and may compose plankton
  • Reproduction ranges from asexual to sexual modes
    • HW
      • Syngamy
  • Include protozoa, algae, slime molds and water molds

© Ryan Barrow 2008

ecological role
Ecological Role
  • Protozoa are an important part of zooplankton.
  • Algae are important producers (autotrophs)
    • Especially in marine and freshwater ecosystems
  • Important source of oxygen

© Ryan Barrow 2008

evolutionary connection
“Evolutionary” Connection
  • Zooflagellates, such as Giardia, may be more closely related to prokaryotes than any other protist group

© Ryan Barrow 2008

evolutionary connection5
“Evolutionary” Connection
  • Endosymbiotic Theory
    • Describes the origin of chloroplasts from photosynthetic prokaryotes and mitochondria from aerobic bacteria
      • Apicomplexans are parasites, and nonphotosynthetic, but have a chloroplast “relic” from secondary endosymbiotic events
        • An apicomplexan causes malaria and a chemical that inhibits chloroplasts may be useful in treatment.
  • Electron microscopy evidence suggests protists are monophyletic but most biologists regards protists as paraphyletic based on structures and molecular data

© Ryan Barrow 2008

the good
The Good
  • Red Algae
    • Agar and carageenan are commercial products derived from red algae
      • Cell walls often have thick sticky polysaccharides
    • Coralline red algae are important in building coral reefs

© Ryan Barrow 2008

the good ii
The Good II
  • Brown Algae
    • Algin is commercial product derived from brown algae
      • HW
        • Where is algin used?
    • Source of food—particularly in Asian countries

© Ryan Barrow 2008

the bad
The Bad
  • The Red Tide
    • Caused by dinoflagellates

© Ryan Barrow 2008

the ugly
The Ugly
  • Malaria
    • Caused by Plasmodium falciparum
    • Could be fatal if untreated

© Ryan Barrow 2008

princeton review book
Princeton Review Book

Princeton Review

Amoeba

  • Students are to memorize the different phyla of Kingdom Protista on pages 129 & 130