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Amoeba and Paramecium Biology 11 Amoeba - GRAMMERS • Growth – 0.6mm biggest (most smaller) • Response – positive to food - negative to harsh chemicals, light and cold. -Can distinguish food from non-food. Amoeba Proteus Amoeba continued… • Adaptations: -pseudopods for moving and feeding. -contractile vacuole -plasmasol / plasmagel • Movement: -by pseudopods or “false feet” -move on solid surfaces – cannot swim -move ~ 20mm/hr Amoeba continued… • Metabolism: -eat by phagocytosis -drink by pinocytosis -food vacuoles develop -digestion by lysosomes -feed on paramecium and flagellates -O2 & CO2 free to diffuse across P.M. Amoeba continued… • Excretion: Exocytosis removes indigestible materials. CO2 diffuses across PM • Reproduction: Asexual – cell division. • Size and Shape: Undefined. Paramecium caudatum Paramecium Grammers • Growth: 0.05 mm avg. • Respond: -react to chemicals – salt and vinegar -live in slightly acidic environments (stagnant H2O) -anterior end sensitive – move by trial and error Paramecium continued… • Adaptations: – Cilia to help feed and escape – Contractile vacuoles – Trichocysts Paramecium continued… • Movement: by cilia in circular motion, move ~ 60 mm/hr • Metabolism: -food pulled into oral groove by cilia -food vacuole forms at gullet -lysosome aids with digestion *Feed mostly on bacteria, smaller protozoans and algae. Paramecium continued… • Excretion: -Contractile vacuole removes excess H20. -C02 across pellicle by diffusion -anal pore removes waste. • Reproduction: Asexual - cell division Sexual – conjugation (exchange of micronucleus DNA) Paramecium continued… • Size and Shape: Defined (due to pellicle) THE END!!! Now - Compare and Contrast