b112_Lecture_28

b112_Lecture_28 - 2/5/2008 1 BIOL 112 Chapter 28 The...

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Unformatted text preview: 2/5/2008 1 BIOL 112 Chapter 28 The Protists General Characteristics of Protists Unicellular Most are motile by cilia or flagella Mitosis in most Cyst formation Cyst formation Generally live in moist conditions In water Damp soil Symbiotic or parasitic in animals The Most Diverse Group of Eukaryotes Nutrition Protozoa Ingestive protists Absorptive protists fungus like Algae Photosynthetic protists Mixotrophs 2/5/2008 2 The Protists as a Taxonomic Mess Protista was never believed to be monophyletic, but taxonomists were at a loss to propose anything better. Modern molecular systematics is helping to Modern molecular systematics is helping to define monophyletic groups. Some groups are still of very uncertain placement. Characteristics of Diplomonadida & Parabasala Only eukaryotes to lack mitochondria Diplomonads reduced mitochondria, no plastids, two nuclei, simple cytoskeleton. Trichomonads (Parabasala) similar to Trichomonads (Parabasala) similar to diplomonads, Trichomonas vaginalis. 2/5/2008 3 Characteristics of Euglenozoa Flagellated Thus sometimes called flagellates 2 Groups Euglenoids Anterior pocket from which 1 2 flagella extend; paramylum as storage polysaccharide; autotrophic ( Euglena ), mixotrophic or heterotrophic.), mixotrophic or heterotrophic....
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This note was uploaded on 06/18/2009 for the course BIOL- 112 taught by Professor Bryanness during the Fall '09 term at Pacific Union.

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b112_Lecture_28 - 2/5/2008 1 BIOL 112 Chapter 28 The...

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