11u bio div 07


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  • The protist destroys red blood cells and other tissues. Can be fatal
  • 11u bio div 07

    1. 1. Protists
    2. 2. ProtistsThe Unicellular Eukaryotes
    3. 3. General Characteristics• First appeared 1.5 billion years ago• First eukaryotic organism• Eukaryotes• Mostly unicellular• Mostly aerobic• Most are motile
    4. 4. • Classified together because they do not fit into other kingdoms, rather than because they are similar or closely related to one another• Most diverse group of eukaryotes
    5. 5. Helpful Protists• Major producers and make up the bulk of the lowest consumer level in aquatic ecosystems.• Used in commodities – Ex. Seaweed is in sushi, toothpaste and paints.
    6. 6. Harmful Protists• Many are parasites• Can cause serious disease – Ex. Malaria and giardiases
    7. 7. The Origin of Eukaryotes• Membrane bound nucleus – Through the infolding of the cell membrane in and ancestral prokaryote in order to increase surface area
    8. 8. The Origin of Eukaryotes• Mitochondria – Through endosymbiosis of an ancestral prokaryote
    9. 9. The Origin of Eukaryotes• Chloroplast – Through endosymbiosis of an ancestral photosynthetic prokaryote
    10. 10. Terms:• Endosymbiosis = a single-celled organisms living inside another organism• Endocytosis = engulfing of particles through the extention of a cell membrane
    11. 11. Examples of some groups: Amoeba NucleusVideo:http://www.youtube.com/watch? Pseudopodia:v=W6rnhiMxtKU extensions of the cytoplasm
    12. 12. AmoebaKey Features• Create pseudopods (extentions of cytoplasm)• UnicellularLocomotion• Pseudopods extend and contractFeeding• Feed through endocytosis• Some are human pathogens (parasites)Ex. amoebic dysentery is cause by an Entamoeba (causes intestinal bleeding)
    13. 13. Flagellates
    14. 14. Key Feature Flagellates• Possess one or more flagella (long whip-like structures)• UnicellularLocomotion FlagellaFeeding Some feed on other protists Some are human pathogens (parasites) Ex. Trypanosoma gambiensis in the tse tse fly causes human sleeping sickness.http://www.youtube.com/watch?v=4aVUrGO97Zg
    15. 15. Sporozoans
    16. 16. SporozoansKey Feature• Produce spores• UnicellularLocomotion Non-motileFeeding Parasitic (obtain nutrients from the bodies of their hosts)Ex. Plasmodium cause malaria.
    17. 17. SporozoansWhen red blood cells bursts toxins are released causing chills and feverSome types of malaria can be fatalVery serious world-wide diseasehttp://www.youtube.com/watch?v=RqRuSwZey_U&feature=related
    18. 18. Slime moulds
    19. 19. Slime mouldsKey Feature• Their life cycles have unicellular stages and multicellular stagesLocomotion• Flagella or pseudopodsFeeding- Heterotrophshttp://www.youtube.com/watch?v=q6rqyaYYZeo&feature=related
    20. 20. Red Algae
    21. 21. Life Cycles• Unicellular protists: – Asexual - Binary fission – Sexual – Conjugation
    22. 22. Life Cycles• Multicellular protists: – Sexual reproduction – Formation of haploid spores (through meiosis) which can fuse to produce a diploid zygote