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Protists

Protists. They’re cool. What is a protist ?. A one or many-celled organism that lives in a wet or moist environment. All have eukaryotic cells Some act like plants, animals, or fungus Usually reproduce asexually by dividing in half or regenerating They can also reproduce sexually.

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Protists

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  1. Protists They’re cool

  2. What is a protist? • A one or many-celled organism that lives in a wet or moist environment. • All have eukaryotic cells • Some act like plants, animals, or fungus • Usually reproduce asexually by dividing in half or regenerating • They can also reproduce sexually.

  3. Plant – like protists • Contain chlorophyll • Make their own food • Known as algae • Some have one cell and some have many cells

  4. Diatoms Have golden-brown pigment that covers up green chlorophyll

  5. Dinoflagellates Name means “spinning flagellates Have two flagella Some have chemicals that cause them to glow at night.

  6. Bioluminescense

  7. 3 Types of Algae • Red Algae – contain chlorophyll but produce lots of red pigment • Found deep in the ocean - don’t need much light

  8. Red Algae

  9. Green Algae • Contain a lot of chlorophyll • Very plant-like • Live close to the surface

  10. Green Algae

  11. Brown Algae • Contain brown pigment (obviously) • Usually found in cool, saltwater environments • Kelp is a type of brown algae

  12. Brown Algae (kelp)

  13. Importance of Algae • Grass of the ocean – staple of the food chain.

  14. Red Tide

  15. Algae and you! • Carrageenan – found in the cell walls of red algae is used in both cosmetics and food. • Toothpaste, pudding, salad dressing

  16. Animal – Like Protists Protozoans: one-celled, animal-like protists. -live in or on other living or dead organisms found in water or soil.

  17. Ciliates Have cilia (short, threadlike structures that extend from cell membrane) Help the organism move

  18. Flagellates Move through environment by whipping their long flagella.

  19. Pseudopods • Not an organism but a type of movement used by some protozoans. • “pseudopod” means false foot • Amoeba is a well-known member of this group. Uses pseudopods to eat and move.

  20. Many protozoans are parasites of humans and other animals. • Live part of their lives in one animal, and part in another. • The parasites that causes malaria, African sleeping sickness, and giardia are all protozoans.

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