Protista

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Protista
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Kingdom Protista is the most diverse of all the
kingdoms.

• Protists can be animal-like, plantlike, or
  funguslike.
• Protists are eukaryotes that are not animals,
  plants, or fungi.
• This makes them very difficult to classify.
• Protista is one of the kingdoms in the domain
  Eukarya.

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Animal-Like Protista

• Are also known as Protozoans, they are
• Aquatic, all are single-celled
• All animals are multicellular
• Heterotrophic (they eat other pathogens,
  parasites, predators)
• Examples
• Pseudopods have pseudopodia (false- feet)
• Engulf by phagocytosis
• Amoebas, Foraminifera
• Flagellates have flagella
• Ex Zooflagellates
• Ciliates have cilia
• Ex Paramecia

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Animal-Like Protista Disease

• Phylum Apicomplexa
• Malaria Infected mosquito bites
• Fever, vomiting, coma, death

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Plantlike Protista

• Also known as Algae, they are
• Mostly single-celled , but some are colonial or
  multicellular they have no leaves, stems, roots
• Perform photosynthesis with chloroplasts
• Ex Seaweed, kelp
• Examples
• Euglenoids use flagella to swim
• They are both animal plant-like
• Dinoflagellates
• Includes most phytoplankton (Basis of aquatic
  food chains)
• Diatoms
• Glasslike shells
• They provide almost ½ the O2 on earth

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Origins of Multicellularity

• Live in 3 arrangements
• 1) Single-celled
• 2) Multicellular colonies independent acting
  cells
• Over time, cells became somewhat specialized
• 3) Multicellular colonies specialized cells
• Over time, cells dependent on others because of
  specialization
• Beginning of multicellular life???

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Fungus-like Protista

• Characteristics
• Decomposers recycle nutrients
• Live in moist environments
• Mobile at stages of life cycle
• True fungi cannot
• Spores can develop cilia
• Example
• Slime Molds large (1 meter) single celled mass
  of cytoplasm
• Fungus animal-like
• Water molds can be parasitic
• Potato blight disease

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Protist classification will likely change.

• Some protists are not closely related.
• Molecular evidence supports reclassification.