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Bio 111 - Lecture 5 - Biology 111 Lecture 5 Domain Eukarya...

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Biology 111 Lecture 5 - Domain Eukarya Kingdom Protista September 17, 2007 Review - Eukarya A. All remaining organisms are eukaryotes 1. Membrane bound nucleus 2. Nucleus is large spheric organelle 3. Chromosomes in nucleus 4. Mitosis and Meiosis I. Traditionally 2 Groups: algae and protozoa algae - autotrophic protozoa - heterotrophic - Recent evidence: artificial groups - Phyla or “algae” can have heterotrophic species - Some algae more closely related to protozoa than to other algae II. “Algae” - autotrophic protists A. Phylum euglenophyta 1. Microscopic, 1 celled 2. Bright green 3. No cell wall, shape shifter 4. Motile. One visible flagellum and another shorter one hidden in a pocket 5. mainly fresh water 6. contain green chloroplasts within the cytoplasm Ex. Euglena has red or yellow eye spot = light sensitive region B. Phylum Pyrrophyta - Dinoflagellates - pyrro “fire” dino “whirling” because of red tides and bioluminescence 1. Microscopic single celled organisms 2. Yellow brown to red accessory pigments mask green chlorophyll 3. Cell walls of cellulose
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4. Two flagella in perpendicular grooves of cell wall. (cause the cell to spin) 5. Marine (salt water) and freshwater - Causes Red Tides - toxins poison fish and invertebrate animals - humans are poisoned when eating seafood during a fed tide - Can produce bioluminescence - chemicals give off light when agitated - basis for the name pyrrophyta C. Phylum Bacillariophyta - Diatoms 1. Microscopic single celled organisms
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