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Protista
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I. Protista A. Structure 1. Live in water 2. Huge variety
A. Plant-like B. Animal-like C. Decomposers
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3. Variety of sizes A. Microscopic the size 100 um to giant seaweed 100 m
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4. Variety of shapes A. Symmetrical B. Asymmetrical
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5. All are Eukaryotes A. Membrane bound nucleus
B. Membrane bound organelles C. Can either be Multicellular or Unicellular
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B. Origin and diversity 1. Been around for 1.5 BY
2. So many that we would need 20 kingdoms to correctly classify them
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3. Easiest way to classify is by the way they eat
A. Animal like- heterotrophs B. Plant like- autotrophs C. Fungus like- heterotrophic on dead matter
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C. Animal-like Protists
1. Protozoan (4 types) Put into different categories by the way they move A. Sarcodinians (Can or Can not have Tests—Shells) Move by psuedopods “False Feet” Ex: Ameba No shell Can form a hard cyst for protection in a drought Causes dysentery
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B. Zooflagellates 1. Has flagella for movement 2. Trichonympha live in the guts of termites a. Mutualistic
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C. Ciliopharans 1. Most numerous and diverse 2. Cilia (hair like projections) 3. Fresh water 4. Form cysts in hard times 5. Mostly harmless, some can be parasitic Paramecium
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D. Sporozoans 1. Parasitic protozoa's 2. Plasmodium (Malaria) Life cycles in both humans and mosquito's
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D. Plant like 1.Divided into two groups. 2. Algae Multicellular
Unicellular 2. Algae A. Perform photosynthesis 1. Contain chlorophyll
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2. Unicellular Dinoflagellates-live in ocean and have 2 flagella
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Diatoms-Cell walls, contain oil to float on water
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Euglenoids-No cell wall, has chloroplasts and photosynthesize
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3. Multicellular A. Parts that resemble plants Classified by color 1. Green Algae (chlorophyta) Chlorophyll b Mostly symbiotic Fresh water
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2. Red Algae (Rhodophyta)
Live in warm salt water Near surface or at depths of 260 meters Can collect light at great depths
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3. Brown Algae (Phaeophyta)
Cool salt water Giant kelp (100 meters long)
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B. Reproduction of Algae
Alternation of generations Alternate between sporophyte and gametophyte
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C. Fungus-like MOLD 1. Characteristics A. Damp and watery places
B. Break down dead matter C. Divided into slime molds or water molds
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1. Plasmodium slime molds
Single celled with many nuclei Can grow to be the size of the palm of your hand
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Cotton like stuff on your food
2. Water molds Cotton like stuff on your food Few are parasites
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