Saturday, January 14, 2012

10. phyla protozoa

a.) amoeba -  cell's organelles and cytoplasm are enclosed by a cell membrane
                           -obtains food through phagocytosis
                           -heterotrophs
                            -single large tubular pseudopod at the anterior end
                            -several secondary tubular pseudopods on the sides
                            -about 220-740μm in length
                            -have at least one nuclei
                           -food is digested in vacuoles
                           -asexual
b.) paramecium - slipper shaped
                            -about 70 - 140 um
                            -covered with simple cilia
                            -moves about 12 body lengths per second
                            -heterotrophs
c.) stylonychia - has cilia grouped into membranelles along the mouth
                            -has cirri over the body
                            -long cirri at the posterior (about 3)
                            -carnivrous
d.)vorticella - inverted bell shape
                            -they are anchored onto the substrate
                            -live in freshwater ponds
                            -reproduce by budding
e. colpidium - curves left
                            -twist forward parallel to anterior
                            -swims in a spiral, rotating around their long axis
                            -kidney shaped
                            -found in moist soil
f.) tetrahymena - have two types of cell nuclei ( large and small)
                            -have hundreds of cilia
                            -complicated microbule structures
                            -switch from commensalistic to pathogenic modes of survival
                            -easy to cultivate and study

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