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October 16-ch20 - Chapter 20 Protist Diversity What are...

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October 16, 2007 Chapter 20 Protist Diversity What are protists? o Any eukaryote that is not a plant, animal, or fungus Polyphyletic o Most single-celled o Most microscopic in size Around 60,000 protist species Diverse modes of nutrition o Ingest food o Typical predators o Pseudopods o Absorb nutrients from environment o Photosynthesize o Protists that absorb nutrients direct from the surrounding environment can be o Some have photosynthetic organelles call chloroplasts o Photosynthetic protists are abundant in oceans, lakes, and ponds o Photosynthetic protists are collectively know and algae Diverse modes of reproduction o Most protists reproduce asexually by mitotic cell division o Some also reproduce sexually o Genetic material from two parents o Environmental/nutritional stimuli o Nonreproductive processes that combine the genetic material of different individual Effects on Humans o Postitive impact – ecolotical role of photosynthetic marine protists o
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