Amoeba Chlamydomonas Euglena Paramecium Protista Amoeba Chlamydomonas Euglena Paramecium

Classification Based on method of locomotion Rhizopoda – have pseudopodia eg amoeba Flagellates include Chlamydomonas & Euglena Ciliates include Paramecium NCEA external questions usually based on normal cell organelles wrt protists OR contractile vacuoles wrt osmoregulation.

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!

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

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

contractile vacuole chloroplast flagellum

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.

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

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

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

Complete table in Chilton booklet Organism Nutrition Movement Osmoregulation Eye spot Amoeba heterotrophic pseudopodia  Contractile vacuoles   n Paramecium heterotrophic  cilia  Contractile vacuoles Euglena heterotrophic and autotrophic  flagellum  contractile vacuole  y Chlamydomonas  heterotrophic and autotrophic flagella  y Organism Nutrition Movement Osmoregulation Eye spot Amoeba heterotrophic   Paramecium cilia Euglena contractile vacuole Chlamydomonas y Complete table in Chilton booklet

Handouts Unicellular Protists handout Clickview Homeostasis (25 min)

MENU Quick Quiz Key Words Videos Exercises Recap Label fun

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

Quick quiz Chemical reactions in living cells are _____ reactions 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

Quick quiz Chemical reactions in living cells are metabolic reactions 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 key model: substrate must fit exactly into the enzyme Induced fit model: enzyme shape can change to fit Enzymes lower the activation energy required to initiate a reaction

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

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

Recap Draw and label each protist Pathfinder p43, q1-3 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

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

flagella eye spot contractile vacuole cell wall starch granule 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

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

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

Mitosis and Cytokinesis Back to menu Mitosis and Cytokinesis No sexual reproduction