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Protists

Chapter 2 Lesson 3. Protists. Key Question: What Are The Characteristics Of Animal-like Protists ?. Key Answer: Like animals, animal-like protists can move to obtain food. Unlike animals, A-L protists or protizoans are unicellular. Animal-like Protists.

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Protists

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  1. Chapter 2 Lesson 3 Protists

  2. Key Question: What Are The Characteristics Of Animal-like Protists? • Key Answer: Like animals, animal-like protists can move to obtain food. Unlike animals, A-L protists or protizoans are unicellular.

  3. Animal-like Protists • Protist- eukaryote that cannot be classified as animal, plant, or fungi • Most are unicellular-not all; some auto, some hetero, some both. • Some cannot move, others can • All eukaryotes, all live in moist surroundings • They are placed into categories b/c they are so different

  4. Protozoan- unicellular, animal-like protist • Pseudopod- “false foot” or temporary bulge of cytoplasm used for feeding and movement in some protozans. • Ex: amoeba • Some protozoans that live in water cannot have excess water so amoebas have… • Contractile Vacuole- structure that collects & expels water from the cell

  5. Protozoans with Flagella • Can live in bodies of other organisms (or waste) • Can have good relationships with the host or bad.

  6. Protozoans with Cilia • Cilia- tiny, hair-like projections on the outside of cells that move in a wave-like manner • Can also sweep food into the organism • 2 nuclei

  7. Protozoans that are Parasites • Feed on host cells & body fluids • Some move on their own, some depend on the host • Ex: Malaria (can have 2 hosts)

  8. http://www.youtube.com/watch?v=ulK9XUd_hh8

  9. What Are The Characteristics Of Plant-like Protists? • Key Answer: Algae are autotrophs, can be unicellular or multi-cellular & use pigments to capture the suns energy.

  10. Plant-like Protists • Algae- common name for a plant-like protist • Much of the oxygen in Earth’s atmosphere is produced by algae • Uni & multi-celled • Unicellular can live together in colonies • Wide variety of color due to pigment • Pigment- chemicals that produce color

  11. Euglenoids • Not Monsters That Live In The Closet • Green algae usually found in fresh water • If no sun, then they will consume food from their environment • Flagellum & an eye spot help it to recognize direction light sources

  12. Dinoflagellates • Surrounded by stiff plates that look like armor • Variety of colors • 2 flagella that twirl the algae like a toy top as they move through the water • Glow in the dark – capable of lighting up ocean surface when disturbed

  13. Diatoms • Glass-like cell walls • Float near land surfaces and attach to rocks • Source of food for water heterotrophs • Move by extracting chemicals & gliding in the slime • Cell walls can be used for cleaning & insecticide after they die

  14. Red Algae • Multi-cellular • Red pigment is good at absorbing the small amount of light on ocean floor • Used in ice cream, hair conditioner • Also food in many Asian cultures

  15. Brown Algae • Many called seaweed (not always brown) • Anchor themselves to rocks (like roots) • Can have stalks & blades (leaf-like structures) • Gas sacs help keep it upright in the water • Used to thicken pudding & other foods

  16. What Are The Characteristics Of Fungus-like Protists? • Key Answer: They are like animals b/c the are heterotrophs, plants b/c they have cell walls & they use spores to reproduce

  17. Fungus-like Protists • Spore – tiny cell that is able to grow into a new organism • 3 Types of Fungus-like Protists • 1. Slime Molds • 2. Water Molds • 3. Downy Mildews

  18. Slime Molds • Wide range of colors • Live in moist shady areas (forest floors) • Ooze onto decaying materials & feed off the bacteria • Some small enough that you need a microscope / some several meters • Use pseudopods to feed • When food is scarce they join together creating a jelly mass

  19. Continued • When conditions are harsh, spore – producing structures grow from jelly & release spores • Creating a whole new slime mold

  20. Water Molds & Downey Mildews • Live near moist places • Look like fuzz • Attack food crops (potatoes, grapes, corn) • Irish Potato Famine

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