BIOL211#3(4)

BIOL211#3(4) - Chapter 28 Introduction Earths first...

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1 Chapter 28 Protists Introduction Earth’s first eukaryotes Two common characteristics – Abundant in moist habitats – Microscopic in size Ecological roles – Algae Photoautotrophic – Protozoa Heterotrophic – Fungus-like protists Bodies, nutrition, or reproduction similar to true fungi Figure 28.1 Habitats – Phytoplankton Swimming or floating protists Photosynthetic – Periphyton Communities attached to underwater surfaces Macroalgae (seaweeds) Motility – Use flagella Flagellates – Use cilia Ciliates – Use pseudopodia Amoebae – Glide along surfaces Peridinium sp.
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2 Paramecium sp. Amoeba sp. Evolution and Relationships Figure 28.5 Excavata – Feeding grove “excavated” into the cells Allows for phagocytosis Basis for endosymbiosis – Two equal-sized nuclei – Multiple flagella Excavata – Metamonads Become parasitic within animals, including human hosts Trichomonas vaginalis Giardia lamblia
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3 Trichomonas vaginalis is the cause of a common sexually transmitted disease Figure 28.7 Giardia lamblia causes severe diarrhea Figure 28.7 Excavata – Euglenoids Possess unique, interlocking ribbon-like protein strips just beneath their plasma membranes Many are heterotrophic, others are photosynthetic Particularly abundant in wetlands Euglenoids – Most familiar member is Euglena Excavata – Kinetoplastids Heterotrophic Have a single, large mitochondrion that contains
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BIOL211#3(4) - Chapter 28 Introduction Earths first...

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