Chapter 20 Outline

Chapter 20 Outline - 1 NOTES FOR BIOLOGY 1002 DR. STEVEN...

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NOTES FOR BIOLOGY 1002 DR. STEVEN POMARICO CHAPTER 20 The Diversity of Protists The Kingdom Protista The Kingdom Protista represents an unusual mix of organisms. The organisms found in this kingdom are all eukaryotes and most are single-celled for most of their life-cycle. Remember the eukaryotic differences: Nucleus (with a double membrane) Organelles 2 or more chromosomes (DNA + proteins) Since the organisms of the kingdom Protista are eukaryotic cells, they are clearly different from the Bacteria and Archaea. The differences between the protists and the rest of the eukaryotes are not quite as clear. Past classifications of the protists organized them into three general groups based on nutritional methods: Plant-like protists - Autotrophic (photosynthetic) Fungus-like protists - Heterotrophic (decomposers) Animal-like protists - Heterotrophic (hunters and symbiotic) Phytoplankton or algae are the photosynthetic eukaryotes at the base of most aquatic food webs (see fig 28-4) They are responsible for most of the photosynthesis (and most of the oxygen production) of the planet. Protozoans are heterotrophic protists, which actively seek and ingest their food (either food particles or other organisms) 1
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The Protists can be organized into eight general groups ( see table 20-1 ): However there is a good deal of uncertainty about the evolution of these groups. Excavates -move via flagella - have a feeding groove - heterotrophic and lack mitochondria The two largest subgroups of the excavates are the diplomonads and the parabasalids Diplomonads -both free living and symbiotic species - have two nuclei - multiple flagella Giardia (see fig 20-3) is a member of this group – infection results from drinks untreated water causing diarrhea etc. Parabasalids
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Chapter 20 Outline - 1 NOTES FOR BIOLOGY 1002 DR. STEVEN...

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