2Classification Based on method of locomotion Rhizopoda – have pseudopodia eg amoebaFlagellates include Chlamydomonas & EuglenaCiliates include ParameciumNCEA external questions usually based on normal cell organelles wrt protists OR contractile vacuoles wrt osmoregulation.
3Amoeba No definite shape Phagocytosis food vacuole stores and digestsMoves by anterior and secondary pseudopods.Would you expect to find an eye spot in amoeba?No – amoeba doesn’t need light – no photosynthesis!
5Chlamydomonas Unicellular flagellate green alga. Chloroplasts for photosynthesis.Pyrenoids are centres of carbon dioxide fixation within the chloroplasts of algaeWould chlamydomonas have an eye spot?Yes – chlamydomonas photosynthesises! Eye spot is part of the large chloroplast
7EuglenaHeterotrophic 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.
9Paramecium 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
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14Key words Metabolism Enzyme-substrate complex Substrate Back to menuMetabolismEnzyme-substrate complexSubstrateLock and Key modelProductInduced fit modelReaction rateExergonicEnzymeEndergonicGlobular proteinActivation energyBiological catalyst3D structureDenaturationActive siteSpecificity
15Quick quiz Chemical reactions in living cells are _____ reactions Back to menuChemical reactions in living cells are _____ reactions____ reactions build up molecules____ reactions break down molecules____ speed up reactions____ are biological catalystsEnzymes are made of ____Enzymes are ____-shapedEnzyme 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 fitEnzymes lower the ____ required to initiate a reactionAnswers
16Quick quiz Chemical reactions in living cells are metabolic reactions Back to menuChemical reactions in living cells are metabolic reactionsAnabolic reactions build up moleculesCatabolic reactions break down moleculesCatalysts speed up reactionsEnzymes are biological catalystsEnzymes are made of proteinEnzymes are globular-shapedEnzyme function depends on its shapeThe active site of the enzyme binds with the substrateLock and key model: substrate must fit exactly into the enzymeInduced fit model: enzyme shape can change to fitEnzymes lower the activation energy required to initiate a reaction
17Exercise Workbook p58 Pathfinder pp42-3 qq 1-4 Chilton Booklet Back to menuWorkbook p58Pathfinder pp42-3 qq 1-4Chilton Booklet
18Videos http://www.youtube.com/watch?v=oddMUHIj0wI Back to menu(7minutes)
19Recap Draw and label each protist Pathfinder p43, q1-3 Back to menuDraw and label each protistPathfinder p43, q1-3Pair up with a friend and teach each otherDraw a mind-map of important processesChilton booklet worksheet