Protists

Protists - Protists Protists The world of Protists Animal­like Protists Plant­like Protists Fungus­like Protists Protist Diversity Protist

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Unformatted text preview: Protists Protists The world of Protists: Animal­like Protists Plant­like Protists Fungus­like Protists Protist Diversity Protist Diversity 200,000 species come in different shapes, sizes, and colors All are eukaryotes – have a nucleus and membrane­bound organelles Protozoans Protozoans Animal­like Protists Protozoans Protozoans Unicellular – made up of one cell Heterotrophs – they eat other organisms or dead organic matter Classified by how they move Phyla of Protozoans Phyla Amoebas Flagellates Ciliates Sporazoans Amoebas: the blobs Amoebas No cell wall Move using pseudopods – plasma extensions Engulf bits of food by flowing around and over them Flagellates: the motorboats Flagellates Use a whip­like extension called a flagella to move Some cause diseases Trichomonas foetus : cow disease Trichomonas vaginalis: an STD Ciliates: the hairy ones Ciliates Move beating tiny hairs called cilia Sporazoans: the parasite Sporazoans Non­motile ­ Do not move Live inside a host One type causes malaria Malaria in red blood cells Pneumonia in aids patients Algae Algae Plantlike Protists What are Algae? What are Algae? Multicellular – made of more than one cell Photosynthetic – make their own food No roots, stems, or leaves Each has chlorophyll and other photosynthetic pigments Phyla of Algae Phyla Euglenoids Diatoms Dinoflagellates Red, Brown, & Green Algae Euglenoids: The Survivors Euglenoids Aquatic Move around like animals Can ingest food from surroundings when light is not available Diatoms: The Golden Ones Diatoms Have shells made of silica (glass) Photosynthetic pigment called carotenoids – give them a golden color Dinoflagellates: The Spinning Ones Dinoflagellates Spin around using two flagella Responsible for Red Tides Create toxins that can kill animals and sometimes people Red Algae: Red Algae The…uh…Red Ones (duh) Seaweeds Multicellular, marine organisms Have red and blue pigments Brown Algae: Brown Algae The Brown Ones (You think?) They have air bladders to help them float at the surface – where the light is. Green Algae: Green Algae Yeah, You Guessed it, The Green Ones Most live in fresh water Can be unicellular or multicellular Live alone or in groups called colonies Fungus­like Protists Fungus­like Protists Characteristics in Common Characteristics in Common All form delicate, netlike structures on the surface of their food source Obtain energy by decomposing organic material Phyla Phyla of Fungus­like Protists Plasmodium Slime Molds Cellular Slime Molds Water Molds & Downy Mildews Slime Molds Slime Molds Live in cool moist, shady places where they grow on damp, organic matter Plasmodium Slime Molds Plasmodium Slime Molds Form plasmodium: a mass of cytoplasm that contains many diploid nuclei but no cell walls or membranes – its feeding stage Creeps by amoeboid movement – 2.5 cm/hour Plasmodium continued… Plasmodium continued… May reach more than a meter in diameter Form reproductive structures when surroundings dry up Spores are dispersed by the wind and grow into new plasmodium Cellular Slime Molds Cellular Slime Molds In feeding mode, they exist as individual amoebic cells When food becomes scarce, they come together with thousands of their own kind to reproduce May look like a plasmodium Water Molds and Downy Water Molds and Downy Mildews Live in water or moist places Feed on dead organisms or parasitize plants Fuzzy white growths That’s All That’s All ...
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This note was uploaded on 11/09/2011 for the course BIO 110 taught by Professor Harmon during the Winter '11 term at BYU.

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