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Amoeba Classifying Amoeba • Kingdom – Protista – Phylum – Protozoa »Genus – Amoeba Where are they found? • Salt and fresh water • Intestines – Parasitic to many organims Size • Microscopic – 0.1 – 0.5 mm Structures • Plasma membrane – Flexible – Permeable • Water • Oxygen • Salts • Ectoplasm – Gel layer • Clear, viscous • Found just inside the plasma membrane • Endoplasm – Fills space within the amoeba • Two phases –Plasma sol – watery –Plasma gel – gelatinous Moving pseusopods – Interaction between ectoplasm and endoplasm • Responsible for formation and movement of pseudopodia –Plasmasol motion »Plasmasol moves into pseudopod forced to become plasmagel »Reversed at other end of cell Plasmasol motion Osmoregulation • Contractile vacuole – Removes fresh water that diffuses into the cell • Reaction to osmosis –Homeostasis – Small or nonexistent in marine amoebas • Phagocytosis – Forming of a psueudopod to engulf food • Part of membrane pinches off –Creates a food vacuole »Fuses with enzyme-filled lysosome »Creates digestion vacuole »Excretes waste Nutrition a. Contractile vacuole b. Food vacuole c. Nucleus
