BIOL 1202 Chapter 28

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Louisiana State University
Biological Sciences
BIOL 1202

1Bio 1202CHAPTER 28ProtistsThe Protists represents an unusual mix of organismsProtists are more diverse than all other eukaryotes and are no longer considered a single kingdomThe organisms found in this are all eukaryotes and most are singlecelled for most of their lifecycle however but some are colonial and there may even be multicellular formsRemember the eukaryotic differencesNucleus with a double membraneOrganelles2 or more chromosomes DNAproteinsSince the Protista are eukaryotic cells they are clearly different from the Bacteria and ArchaeaThe differences between the protists and the rest of the eukaryotes are not quite as clearProtists are nutritionally diverse and can be organized them into general groups based on nutritional methodsAutotrophic photosynthetic Heterotrophic decomposersHeterotrophic ingestionhunters and symbioticMixotrophic combining photosynthesis and ingestive or absorptive methodsThe evolution of protists is the results of endosymbiosis see fig 282Primary endosymbiosis resulted in plastidbearing lineages which evolved into red and green algaeSecondary endosymbiosis resulted in greater diversificationThe current state of what was kingdom protista is five supergroups see fig 283ExcavatesChromalveolatesRhizariansArchaeplastidsUnikontesExcavatesmove via flagellahave a feeding grooveheterotrophic and have modified mitochondria
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