Unit 6: Microorganisms and Fungi Chapter 20: Protists
Key Concepts: • What are protists? • What are the types of animal-like protists? • What are the types of plant-like protists? • What are the types of fungus-like protists?
A. The Kingdom Protista • Protists - any organism that is Eukaryotic; but not a plant, animal, or fungi. • Protists can be unicellular, multicellular, or colonial.
Protists are either: • heterotrophic (animal-like) • autotrophic (plant-like) • decomposers/parasites (fungus-like)
B. Animal-Like Protists • Phylum Zooflagellates – • Move using a flagella (whip-like tail) • Can have one or two flagella • Most reproduce asexually • Absorb food through their cell-membranes
Phylum Sarcodina – (sarodines) • Move by pseudopodia (false feet) • Usually live in water • Captures food by wrapping the pseudopodium around it and ingesting it. • Example: Amoeba
Phylum Ciliophora (ciliates) • Use cilia for feeding and movement • Found in fresh and salt water • Free-living – don’t exist as parasites • Example: Paramecium
Phylum Sporozoa • All members of this phyla are PARASITES • Life cycles involve more than one host • Examples: The Plasmodium sporozoan causes malaria and is carried by the female Anopheles mosquito
Figure 20-7 The Life Cycle of Plasmodium Section 20-2
C. Plant-Like Protists • Phylum Euglenophyta (euglenophytes) • Move by 2 flagellas • Have no cell wall • Reproduce asexually • Performs photosynthesis (make’s it’s own food) • Example: Euglena
Phylum Chrisophyta (chyrsophytes): • Gold-colored chlorophyll • Includes yellow-green algae and golden-brown algae
Phylum Bacillariophyta (Diatoms) • Produce thin, delicate cell walls rich is silicon – the main component of glass • Sexually reproduce and asexually reproduce.
Phylum Pyrrophyta (dioflagellates) • ½ are photosynthetic • ½ are heterotrophic • Have 2-flagella • Reproduce asexually • Cause of red Tides
Phylum Rhodophyta: (red Algae) • Lives in deep water • Contains chlorophyll A • Multicellular • Helps form coral reefs
Phylum Phaeophyta (Brown Algae) • Marine organisms • Live in shallow water • Most complex algae • Contains Chlorophyll A and C
Phylum Chlorophyta: (green algae) • Cell wall • Chlorophyll A and B • Found in fresh and marine water • Single celled, multi celled, and colonial.
C. Fungus – Like Protists • Phylum Acrasiomycota (cellular slime molds) • Free-living cells • Absorb nutrients from dead/decaying matter
Phylum Myxomycota (acellular slime molds) • Single cell with many nuclei
Phylum Oomcota (water Mold) • Feed on dead or decaying matter, • Both sexual and asexual reproduction • Caused the Potato Famine of Ireland in 1846