PROTISTS Chapter 21

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

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

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. 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.

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?!?! 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?!?!

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. 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.

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”. 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”.

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

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. 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.

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. 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.

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. 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.