Lecture_2_-_Protista_posted

Lecture_2_-_Protista_posted - Protists A World in a Drop of...

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Protists: A World in a Drop of Water Even a low-power microscope can reveal an astonishing menagerie of organisms in a drop of pond water. Many of these beautifully ornate creatures belong to a diverse group of organisms called the protists. Figure 28.1 50 μ m Protists were first discovered 300 years ago by the Dutch microscopist Antoni van Leeuwehnhoek
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These amazing organisms were once all classified into one kingdom of mostly single-celled eukaryotes known as _______ Advances in eukaryotic systematics have caused the classification of protists to change significantly. The kingdom Protista is not recognized any longer by many biologists. Instead it is considered a loosely related group of eukaryotes that are neither ………. . What are Protists? Protists Diversity
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A sample of protist diversity Protists Diversity
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Most protists are _________, yet there are some colonial or multicellular. While they are classified separately, some are more closely related to prokaryotes, some look like ______, while others have similar life-cycles to ______ or are similar to _______. What are Protists? Volvulina steinii colony Paramecium Feather Boa Kelp Protists Diversity
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Protists are the most nutritionally diverse of all eukaryotes. Include 3 modes ____________ , which contain chloroplasts _____________ , which absorb organic molecules or ingest larger food particles __________ , which combine photosynthesis & heterotrophic nutrition Nutrition Modes Nutrition modes help us understand protists’ ecological rolls. Photosynthetic ones are plant-like (alga), ingestive ones are animal-like (protozoans), & absorptive ones are fungi-like. Protists Diversity
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Protist habitats are quite diverse. Most are aquatic, but can be found free-living anywhere there is water including marine habitats & damp soil or leaf litter. They also are found as ……. . Protists are a large part of the ________________ community as well 100 μ m 100 μ m 4 cm 500 μ m (a) (b) (c) (d) Protists Diversity Habitat Diversity Spirogyra, a filamentous freshwater green alga Delesseria sanguinea, marine red alga Ceratium tripos, a marine dinoflagellate The freshwater ciliate Stentor,
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Reproduction and life cycles are also highly varied among protists, with both sexual and asexual species Protists Diversity Reproductive Diversity All three basic types of sexual life cycles are found in protists along with some interesting variations 3 basic types of life cycles 1. ___________ 2. ___________ 3. _____________
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2 Fundamental Processes in Sexual Reproduction During a life cycle the diploid (2n) phases undergoes meiosis while haploid (1n) phases undergoes syngamy ___________ (unification of sexual cells) ___________ (division of sexual cells) VS.
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3 Types of Life Cycles 1. Haplontic _______ meiosis 1. Diplontic _______ meiosis 3. Haplodiplontic _______ meiosis
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Haplontic Sexual Life Cycle with zygotic meiosis 1N 2N -No multicellular diploid phase -“adults” are _______ - Found in ……………………. .
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Diplontic Sexual Life Cycle with gametic meiosis -No multicellular haploid phase, -“adults” are ______ -found in …. .
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Haplodiplontic Sexual Life Cycle with sporic meiosis - Multicellular haploid and diploid stages -“adults” can be ______ or _______ - Found in …….
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Haplodiplontic Sexual Life Cycle
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This note was uploaded on 05/18/2008 for the course BIOL 211B taught by Professor Lowe/zahn during the Spring '08 term at CSU Long Beach.

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Lecture_2_-_Protista_posted - Protists A World in a Drop of...

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