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Protists

Protists. PROTISTS. We have already learned about Bacteria and Viruses Now it’s time to study Protists MICROBES: Viruses Bacteria Protists ?. PROTISTS. Protists can be very different from each other. All protists are EUKARYOTES = DNA is found in a nucleus

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Protists

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  1. Protists

  2. PROTISTS • We have already learned about Bacteria and Viruses • Now it’s time to study Protists MICROBES: • Viruses • Bacteria • Protists • ?

  3. PROTISTS • Protists can be very different from each other. • All protists are EUKARYOTES = DNA is found in a nucleus • Some are like animals, some are like plants, some are like fungi, but they are a little different. So they are Protists. • All live in moist environments • Some are UNICELLULAR, while others are MULTICELLULAR

  4. PROTISTS • Some are HETEROTROPHS • Some are AUTOTROPHS • Some are BOTH What are heterotrophs? Autotrophs? Imagine being both….

  5. PROTISTS 3 CATEGORIES OF PROTISTS: • Animal-like Protists • Plant-like Protists • Fungus-like Protists

  6. Animal-like PROTISTS ALSO CALLED PROTOZOANS • All animal-like protists are HETEROTROPHS • Most are able to move from place to place to get their food. 4 GROUPS OF PROTOZOANS: • Protozoans with PSEUDOPODS • Protozoans with CILIA • Protozoans with FLAGELLA • Protozoans that are PARASITES

  7. Protozoans With Pseudopods • Sarcodines have PSEUDOPODS = means “false foot”. Part of the cytoplasm bulges towards one location, and the rest of the organism follows. • Sarcodines include: Amoebas • Amoebas also have CONTRACTILE VACUOLES = a structure that collects extra water then squirts it out from the cell.

  8. An Amoeba

  9. Protozoans With Cilia • Ciliates have CILIA = hair-like projections from cells that move with a wavelike motion. • Ciliates include: Paramecium • Paramecium have 2 Nuclei, 2 contractile vacuoles, and can reproduce asexually and sexually.

  10. Paramecium

  11. Protozoans with Flagella • Flagellates have flagella • Some of these live inside other organisms. • SYMBIOSIS = a close relationship in which at least one of the species is helped. • MUTUALISM = a close relationship in which both species are helped.

  12. Protozoans that are Parasites • Some protozoans feed on the cells of their host and cause harm.

  13. Plant-like PROTISTS • Commonly called ALGAE (that green stuff on a pond) • All are AUTOTROPHS THE DIFFERENT GROUPS OF ALGAE: • Diatoms • Dinoflagellates • Euglenoids • Red Algae • Green Algae • Brown Algae

  14. Euglenoid

  15. Fungus-like Protists • All are HETEROTROPHS • All have Cell Walls • All use SPORES to reproduce • All can move at some point in their lives THE 3 KINDS OF FUNGUS-LIKE PROTISTS: • Slime molds • Water molds • Downy molds

  16. Slime Mold

  17. Good things Protists do • Symbiosis and mutualism with other organisms. • Algae are main source of oxygen in atmosphere. • Provide food for other organisms • Household products (diatoms)

  18. Bad things Protists do • Cause disease • Attack crops

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