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Protista

Protista. Amoeba Chlamydomonas Euglena Paramecium. Classification. Based on method of locomotion Rhizopoda – have pseudopodia eg amoeba Flagellates include Chlamydomonas & Euglena Ciliates include Paramecium. Amoeba. N o definite shape

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Protista

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  1. Protista Amoeba Chlamydomonas Euglena Paramecium

  2. Classification Based on method of locomotion • Rhizopoda – have pseudopodia eg amoeba • Flagellates include Chlamydomonas & Euglena • Ciliates include Paramecium

  3. Amoeba • No definite shape • Phagocytosis food vacuole stores and digests • Moves by anterior and secondary pseudopods. Would you expect to find an eye spot in amoeba? No – amoeba doesn’t need light – no photosynthesis!

  4. food vacuole contractile vacuole pseudopod http://www.microscopyu.com/moviegallery/pondscum/amoeba/ (very short)

  5. Chlamydomonas • Unicellular flagellate green alga. • Chloroplasts for photosynthesis. • Pyrenoids are centres of carbon dioxide fixation within the chloroplasts of algae Would chlamydomonas have an eye spot? Yes – chlamydomonas photosynthesises! Eye spot is part of the large chloroplast

  6. contractile vacuole chloroplast flagellum

  7. Euglena • Heterotrophic phagocytosis AND Autotrophic photosynthesis (has chloroplasts) • Fresh water / salt water / soil. • Whip-like flagellum. • Can form dormant spore in dry conditions. Would euglena have an eye spot? Yes – usually red, near flagellum.

  8. eye spot contractile vacuole chloroplast http://www.microscopyu.com/moviegallery/pondscum/euglena/ (very short)

  9. Paramecium • Freshwater ciliate • Deep oral groove with oral cilia which draw food inside. • The bubbles throughout the cell are also vacuoles. • Cilia all over the body or restricted only to certain regions. Would paramecium have an eye spot? No

  10. http://www.youtube.com/watch?v=l9ymaSzcsdY&NR=1&feature=fvwp(eating)http://www.youtube.com/watch?v=l9ymaSzcsdY&NR=1&feature=fvwp(eating) meganucleus contractile vacuoles http://www.microscopyu.com/moviegallery/pondscum/paramecium/ (short)

  11. Complete table in Chilton booklet

  12. Handouts • Unicellular Protists handout Clickview • Homeostasis (25 min)

  13. MENU Quick Quiz Key Words Videos Exercises Recap Label fun

  14. Key words Back to menu • Metabolism • Substrate • Product • Reaction rate • Enzyme • Globular protein • Biological catalyst • 3D structure • Denaturation • Active site • Specificity • Enzyme-substrate complex • Lock and Key model • Induced fit model • Exergonic • Endergonic • Activation energy

  15. Quick quiz Back to menu • Chemical reactions in living cells are _____ reactions • ____ reactions build up molecules • ____ reactions break down molecules • ____ speed up reactions • ____ are biological catalysts • Enzymes are made of ____ • Enzymes are ____-shaped • Enzyme function depends on its ____ • The ____ site of the enzyme binds with the substrate • ____ model: substrate must fit exactly into the enzyme • ____ model: enzyme shape can change to fit • Enzymes lower the ____ required to initiate a reaction Answers

  16. Quick quiz Back to menu • Chemical reactions in living cells are metabolic reactions • Anabolic reactions build up molecules • Catabolic reactions break down molecules • Catalysts speed up reactions • Enzymes are biological catalysts • Enzymes are made of protein • Enzymes are globular-shaped • Enzyme function depends on its shape • The active site of the enzyme binds with the substrate • Lock and keymodel: substrate must fit exactly into the enzyme • Induced fit model: enzyme shape can change to fit • Enzymes lower the activation energyrequired to initiate a reaction

  17. Exercise Back to menu • Workbook p58 • Pathfinder pp42-3 qq 1-4 • Chilton Booklet

  18. Videos Back to menu • http://www.youtube.com/watch?v=oddMUHIj0wI • http://www1.teachertube.com/viewVideo.php?title=Kingdom_Protista&video_id=223926 (7minutes)

  19. Recap Back to menu Draw and label each protist Pathfinder p43, q1-3 Pair up with a friend and teach each other Draw a mind-map of important processes Chilton booklet worksheet

  20. Amoeba Nutrition – pseudopods engulf _____ food Locomotion – flowing of __________ psudopod Osmoregulation – contractile vacuoles expel ___________ water Back to menu Contains ingested ___________ food

  21. flagella 2 hairlike projections for rapid, jerky movement for light detection eye spot contractile vacuole osmoregulation Back to menu storage cell wall starch granule composed of cellulose pyrenoid starch formation

  22. Back to menu beats for locomotion eye spot for light detection osmoregulation flexible, inside plasma membrane – cell can change shape

  23. beat for locomotion Back to menu oral groove with cilia to beat food into mouth 2

  24. Back to menu Mitosis and Cytokinesis No sexual reproduction

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