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Protists - PowerPoint PPT Presentation

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Protists

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  1. Protists Chapter 25

  2. Protists • Single-celled or simple multicellular eukaryotic organisms that generally do not fit in any other kingdom. all images are from http://images.google.com

  3. Protists • The most diverse group of eukaryotes. • Some of the oldest eukaryotic cells • Scientists hypothesize that protists and other eukaryotes arose from ancient prokaryotes that lived in endosymbiosis

  4. Characteristics • Unicellular and Multicellular • Nutrition – autotrophs and heterotrophs • Motility – Most protists are able to move at some time during their life cycles • Flagella, Cilia, or Pseudopodia

  5. Animal-Like Protists • Most are heterotrophs that move about capturing and consuming prey. • Other phyla are characterized by how they move

  6. Plant-Like Protists • Most plantlike protists are known as algae • Have chloroplasts and are autotrophic • Not plants – no roots, stems, or leaves

  7. Plant-Like Protists • Most algae are aquatic and have flagella at some point in their life cycle Colonial Unicellular Filamentous Multicellular

  8. Plant-Like Protists green brown red golden diatoms dinoflagellates euglenoids

  9. Fungus-Like Protists • Slime Molds and Water Molds

  10. Protists in the Environment • Produce large amounts of oxygen, form the foundation of food webs, recycle materials, and play a role in several symbiotic relationships.

  11. Protists in Industry • Humans eat protists directly (seaweed) and use them as food additives, as fertilizers, and in cosmetics and medicines. http://students.hthcv.hightechhigh.org/~mescalona/seaweed.jpg

  12. Protists and Health • Protist parasites cause disease • Malaria • Giardasis • Cryptosporidiosis • Trichomoniasis

  13. Fungi Chapter 26

  14. Fungi • eukaryotic, nonphotosynthetic organisms, and most are multicellular heterotrophs. http://www.williamsclass.com/SixthScienceWork/Classification/ClassificationNotes/images/fungiMushroom.jpg

  15. Molds – are tangled masses of filaments of cells Yeasts – unicellular fungi whose colonies resemble those of bacteria Fungi • Most are microscopic molds or yeasts

  16. Fungi • Get their nutrients by absorbing organic molecules from their environment • Most are saprophytic organisms

  17. Fungi • Dimorphism – ability to exist in two different forms • Reproduce both sexually and asexually http://www.broadinstitute.org/annotation/genome/dimorph_collab/assets/dimorphic.montage.png

  18. http://www.nature.com/nri/journal/v4/n1/images/nri1255-i1.jpghttp://www.nature.com/nri/journal/v4/n1/images/nri1255-i1.jpg

  19. Mycorrhizae – a symbiotic structure formed by a fungus and plant roots Lichens – a symbiotic relationship between a fungus and a photosynthetic partner. Will see them growing on rocks – decompose the rock to produce soil Fungi

  20. Human Fungal Diseases • Athletes foot • Ringworm • Yeast infections • Jock itch • Histoplasmosis

  21. Fungi in Industry • Antibiotics – penicillium, cephalosporin, and the anti-inflammatory cortisone • Genetic engineering – manipulating yeast cells • Yeast is used in making ethanol

  22. Fungi and Food Industries • Yeast • Mushrooms – club fungi • Truffles • Morels