28_Lectures_2008_Class

28_Lectures_2008_Class - Chapter 28 Protists Key Concepts...

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Chapter 28 Protists
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Key Concepts 28.1 Most Eukaryotes are single-celled organisms 28.2 Excavates are include protists with modified mitochondria and protists with unique flagella 28.3 Chromalveolates may have originated by secondary endosymbiosis 28.4 Rhizarians are a diverse group of protists defined by DNA similarities 28.5 Red and green algae are the closest relatives of land plants 28.6 Unikonts include protists that are closely related to fungi and animals 28.7 Protists play key roles in ecological relationships
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Overview: Living Small Even a low-power microscope can reveal a great variety of organisms in a drop of pond water Protist is the informal name of the kingdom of mostly unicellular eukaryotes Advances in eukaryotic systematics have caused the classification of protists to change significantly Protists are eukaryotes and thus have organelles and are more complex than prokaryotes
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Life in a drop of water
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Fig. 28-01 1 µm
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Concept 28.1: Most Eukaryotes are single-celled organisms Protists are more diverse than all other eukaryotes and are no longer classified in a single kingdom Actually the Kingdom Protista was paraphyletic (of a group of organisms) descended from a common evolutionary ancestor or ancestral group, but not including all the descendant groups. some protist are actually more closely related to plants the Kingdom has been abandoned, but the term protist is still used to refer to eukaryotes that are neither plants, animals, nor fungi Most protists are unicellular, but there are some colonial and multicellular species
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Structural and Functional Diversity in Protists Protists exhibit more structural and functional diversity than any other group of eukaryotes Single-celled protists can be very complex, as all biological functions are carried out by organelles in each individual cell
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http://www.uog.edu/dns/Lobban.htm Protists are also diverse in habitat, including freshwater and marine species QuickTimeª and a YUV420 codec decompressor are needed to see this picture. QuickTimeª and a decompressor are needed to see this picture.
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Protists , the most nutritionally diverse of all eukaryotes, include: Photoautotrophs , which contain chloroplasts Plant-like Heterotrophs , which absorb organic molecules or ingest larger food particles Can be either: Animal-like (ingestive) Fungi-like (absorptive) Mixotrophs , which combine photosynthesis and heterotrophic nutrition same separations as above Protists are an extremely diverse assortment of eukaryotes
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The freshwater ciliate Stentor , a unicellular protozoan (LM) 100 µm 100 µm Ceratium tripos , a unicellular marine dinoflagellate (LM) 500 µm Delesseria Sanguinea , a multicellular marine red alga Spirogyra , a filamentous freshwater green alga (insert LM) 4 cm
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http://www.micrographia.com/ http://biodidac.bio.uottawa.ca/ Reproduction and life cycles are also highly varied among protists, with both sexual and asexual species Reproduction
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28_Lectures_2008_Class - Chapter 28 Protists Key Concepts...

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