Ch 25 - Photosynthetic Protists

Ch 25 - Photosynthetic Protists - Photosynthetic Protists...

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Photosynthetic Protists Protists were the first eukaryotic cells to evolve from ancestral prokaryotes (serial endosymbiosis) Chapter 25 Protists Mostly unicellular eukaryotic organisms that live in aquatic environments Unlike prokaryotes, contain nuclei and other membrane-enclosed organelles eg mitochondria, 9+2 flagella, multiple chromosomes, and chromatin Sexual reproduction: meiosis and mitosis Sizes of Protists Unicellular organisms – size variable Microscopic Colonies loosely connected groups of cells Coenocytes multinucleate masses of cytoplasm Multicellular organisms composed of many cells Still simple in body form Chlamydomonas A unicellular protist (green alga) Nutrition Protists obtain their nutrients: autotrophically (make complex organic nutritive compounds from simple inorganic sources using photosynthesis) heterotrophically (require organic compounds of carbon and nitrogen for nourishment; obtained by absorption) Or a mix of both Interactions Protists are free-living or symbiotic
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Symbiotic relationships range from: mutualism (equal partnership) commensalism (one partner benefits, other unaffected) to parasitism (one thrives, other harmed) Habitats Most protists live in oceans (plankton) freshwater ponds Lakes and streams Parasitic protists live in body fluids of hosts (talk about those in Spring) e.g. Trichomonas vaginalis - vaginitis Reproduction Many protists reproduce both sexually and a-sexually
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