Lab7_ProtistaII_Fungi

Lab7_ProtistaII_Fungi - Exercise 26 Kingdom Protista Three...

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1 • Three general groups: algae, protozoans, and slim molds. • Protozoan (proto = first, zoan = animal) – Eukaryotes with an animal-like, heterotrophic lifestyle. – Have food vacuoles to enclose food particles for digestion and contractile vacuoles to expel excess water. – Motility through variety of features Exercise 26 Kingdom Protista Characteristics of major phyla of protozoans Table 26.1 • Heterotrophs with no permanent locomotor apparatus Amoebas Rhizopoda Amoeba Move by psuedopodia Forams Foraminifera Forams Rigid shells; move by photoplasmic streaming • Heterotrophs with flagella Zoomastigotes Sarcomastigophora Trypanosoma Heterotrophic, unicellular Ciliates Ciliophora Paramecium Heterotrophic, unicellular with two nuclei • Nonmotile spore-formers Sporozoans Apicomplexa Plasmodium Nonmotile, unicellular • Hetertrophs with restricted mobility Water molds Oomycota Water molds, rusts mildew Terrestrial and freshwater Cellular slime molds Acrasiomycota Dictyostelium Colonial aggregations of cells Plasmodial slime molds Myxomycota Physarum Stream along as a multinucleate mass Group Phylum Example Key characteristics
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2 (1) Phylum Rhizopoda (Amoebas) • The presence of pseudopods , movable extensions of cytoplasm used for locomotion and gathering food. • Lack flagella • Reproduce asexually • Genus amoeba Pseudopodium Phagocytic: engulf food particle and form food vacuole surrounded by membrane. – Intracellular digestion Contractile vacuole maintains cell’s water balance by accumulating or expelling excess water. Phylum Rhizopoda (Amoebas) Difflugia • A protective case of sand grains called a test . • Test is referring to a secreted or partially secreted covering, much like a shell. Test Pseudopodia
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3 (2) Phylum Foraminifera (Forams) • “shell amoebas” surround themselves with a secreted test and have pheudopods . • The test is made of calcium carbonate and is perforated with pores allowing thin pseudopods to protrude. (3) Phylum Sarcomastigophora (Zoomastigotes) • Unicellular, heterotrophic, and have at least one flagellum. • Parasitic as well as free-living forms Trypanosoma – Pathogenic and cause African sleeping sickness and Chagas’ disease – Common in tropics and spread by infection from biting insects Trypanosoma among red blood cells: nuclei, anterior flagella
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4 (4) Phylum Ciliophora (Ciliates) • 8,000 species • All having large numbers of cilia . – Flagella and cilia have identical structures; but flagella are long and are usually found alone or in pairs, whereas cilia are short and numerous. • Have two types of nuclei:
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This note was uploaded on 02/25/2011 for the course BIO 138 taught by Professor Wu during the Summer '08 term at Staten Island.

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Lab7_ProtistaII_Fungi - Exercise 26 Kingdom Protista Three...

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