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PROTISTS

PROTISTS. Chapter 21. QUICK REVIEW. Protists: single-celled living organisms that are more complex and varied than bacteria. Believed to have evolved from bacteria. QUICK REVIEW. Some protists are autotrophic (also referred to as plant-like protists).

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PROTISTS

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  1. PROTISTS Chapter 21

  2. QUICK REVIEW • Protists: single-celled living organisms that are more complex and varied than bacteria. • Believed to have evolved from bacteria.

  3. QUICK REVIEW • Some protists are autotrophic (also referred to as plant-like protists). • Some protists are heterotrophic (also referred to as animal-like protists).

  4. INTRO TO PROTIST LAB In this lab we are going to look at four different types of protists: Paramecium Amoeba Euglena Diatoms

  5. INTRO TO PROTIST LAB Euglena • A plant-like AND animal-like protist. • Plant-like because this organism contains, chloroplasts, which make food. • Animal-like because it can move from place to place. Uses a flagellum to do so.

  6. INTRO TO PROTIST LAB Euglena (cont.) • Does not contain a cell wall. • Has a sense organ called an eye-spot to detect light and dark environments. • Why is this important?!?!

  7. INTRO TO PROTIST LAB Paramecium • An animal-like protist. Does not contain chloroplasts to make own food. • Uses tiny hairs called cilia to move through the environment. • Food intake through oral groove. Waste exits through anal pore.

  8. INTRO TO PROTIST LAB Amoeba • An animal-like protist. Does not contain chloroplasts to make own food. • Moves by changing shape. Limb-like extensions called pseudopodia, meaning “false-foot”.

  9. INTRO TO PROTIST LAB Amoeba (cont.) • Food intake by engulfing. Uses pseudopodia to do so.

  10. INTRO TO PROTIST LAB Diatoms • Protists with unique shells made up of silica. • Plant-like because they make their own food using chloroplasts. • Plant-like because they cannot move on their own.

  11. INTRO TO PROTIST LAB • Abundant in the ocean. • Empty shells of diatoms form thick deposits called “diatomaceous earth”, which is used commercially in abrasives, street paint, and even toothpaste.

  12. PROTIST LAB • Your job, in pairs, is to… -Examine euglena, paramecium, amoeba, and diatoms using a compound light microscope at 400x magnification. -Accurately draw diagrams of each organism, labeling specific characteristics as indicated on your lab handout. -Answer post-lab questions after you complete your diagrams.

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