CAS BI 108 Lecture Notes - Lecture 4: Contractile Vacuole, Reproduction, Amoeboid Movement
11 Nov 2016
School
Department
Course
Professor
Document Summary
Three most important phyla: based on mode of locomotion: sarcomastigophora: includes the amebas and the flagellates, apicomplexa: all parasitic, ciliophora: ciliates. Consist of active or vegetative phases and cyst phases (encystment) Trophozoite = the vegetative form of a protozoan. Cyst = a resistant, quiescent (sleeping) stage in a cyst wall. Includes protozoa that move by flagella (mastigophorans) and those that move by pseudopodia (sarcodinans) Have a stigma, or eyespot, a light sensitive receptor. Trypanosoma brucei = causes african sleeping sickness, transmitted by the tsetse fly. Move and feed by means of pseudopodia. Found in fresh and marine water, moist soils. A few are parasitic, transmitted through feces. Many chambered tests of calcium carbonate and: phylum ciliophora. Most are free living, though some are commensalistic or parasitic. Are always multinucleated, possessing at least one macronucleus and one micronucleus: Pellicle: thickened cell membrane or tough outer sheath. Possess cytostome (cell mouth) and cytopharynx (gullet)
