bio 315 chapter 12

bio 315 chapter 12 - Chapter 12: Eukaryotic Classification...

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Chapter 12: Eukaryotic Classification Classification of Eukaryotic Microorganisms Domain: Eukarya Kingdoms: o Protista – unicellular eukaryotes, includes algae, protozoa, and slime molds – extremely paraphyletic group! o Fungi – multicellular eukaryotes, includes yeasts, molds, etc. o Animalia – multicellular eukaryotes, mainly certain microscopic worms and rotifers Kingdom Protistia: Algae (usually viewed as a “Sub-Kingdom”) Algae are “plant-like” protists, in that they photosynthesize using chlorophyll (they’re photoautotrophs) They’re usually unicellular, although there are some apparent exceptions (like ‘seaweeds’) Almost always live in aquatic environments, where they are important primary producers. Divisions of Algae: “Seaweeds” Multicellular with no true tissues Phaeophyta – “the brown algae”, commonly called “kelps”. They appear brown/tan because they contain an accessory pigment called fucoxanthin. Algin, a food thickener/emulsifier, is obtained from them. Rep. genus: Sargassum Rhodophyta – “the red algae”. They appear reddish because they contain phycobilin accessory pigments. Agar, used as bacterial media, is obtained from them. So is the food additive carrageenan. Rep. genus: Gelidium Chlorophyta – “the green algae”. Most are unicellular with cellulose cell walls (Spyrogyra – pond scum); (Ulva – sea lettuce, which is a multicellular seaweed) green algae are almost certainly the ancestors of modern terrestrial plants
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This note was uploaded on 04/07/2008 for the course BIO 315 taught by Professor Schmidt during the Spring '08 term at SUNY Stony Brook.

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bio 315 chapter 12 - Chapter 12: Eukaryotic Classification...

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