BIO 1 Notes Protists 1 - Notes Principles of Biology...

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Notes Principles of Biology 02/10/14 Protists Ernest Haeckel (1834-1919) German naturalist, named thousands of new species Introduced the terms protist and phylogeny Protists represent a separate kingdom, i.e. the “ kingdom of primitive forms The first eukaryotes The hypothesis of endosymbiosis proposes that mitochondria and plastids were formerly small prokaryotes living within larger host cells An endo symbiont is a cell that lives within a host cell Symbiosis (=Greek for “living together”) 1) Mutualism both organisms benefit 2) Commensalism- one organism benefits, the other is unaffected 3) Parasitism- one organism benefits at the expense of the host Host - larger organism Symbiont- smaller organism Endo symbiont- smaller organism living within its host
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Unformatted text preview: What is a protist? • Be careful when using the term “protist”! • The Protists no longer constitute a kingdom • They are distributed in five supergroups of eukaryotes What is a protist? • A eukaryote that is neither a fungus, a plant nor an animal • mostly unicellular (except some colonial and multicellular species) • mostly microscopic (except several types of algae) • mostly aquatic (freshwater and marine) • nutritionally diverse (photoautotrophs and chemo heterotrophs) Stentor (ciliate) • unicellular • microscopic • freshwater • chemoheterotrophic Delesseria sanguinea (red alga) • multicellular • macroscopic • marine • photoautotroph...
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