Chapter 29

Chapter 29 - Chapter 29: Protists Eukaryotes: o Nuclear...

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Chapter 29: Protists Eukaryotes: o Nuclear envelope o System of structural proteins called the cytoskeleton o Undergo cell division via mitosis o Have chromosomes where DNA is complexed with proteins called histones Protist: all eukaryotes that are not green plants, fungi, or animals o *As you study this tree, not that protists do not make up a monophyletic group. Instead, protists constitute a paraphyletic group—meaning that they represent some, but not all, of the descendents of a single common ancestor. No synapomorphies define the protists. There is no trait that is found in protists but no other organisms. o Found in wet soils, aquatic habitats, or bodies of other organisms o *Four species of the protist Plasmodium are capable of parasitizing humans and causing malaria. o *Because each Plasmodium species spends part of its life cycle inside mosquitoes, most antimalaria campaigns have focused on controlling these insects. Ecological Importance of Protists o Primary producers: any organism that creates its own food by photosynthesis or from reduced inorganic compounds and that is a food source for other species in its ecosystem o Plankton: small organisms that live near the surface of oceans or lakes and that drift along or swim only short distances Phytoplankton: photosynthetic species of plankton that produce sugars and other organic compounds; basis of foods chains in freshwater and marine environments o Food chain: describes nutritional relationships among organisms o Global warming: Global carbon cycle: the movement of carbon atoms from carbon dioxide molecules in the atmosphere to organisms in soil or the ocean, and then back to the atmosphere Studying Cell Structure o *Detailed studies of cell structure revealed that protists could be grouped according to characteristic overall form, according to organelles with distinctive features, or both. o
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This note was uploaded on 04/15/2008 for the course LS 1 taught by Professor Thomas during the Winter '05 term at UCLA.

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Chapter 29 - Chapter 29: Protists Eukaryotes: o Nuclear...

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