MICR 2420 Lecture Notes - Lecture 9: Choanoflagellate, Paramecium, Opisthokont
26 Dec 2015
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Most protists free-living predators in soil and water. Defined by the presence of nucleus and membrane-enclosed organelles. All descend from ancestral cell that enfulfed bacterial endosymbiont > mitochondria > aerobic respiration. All phototrophs from cell that engulfed bacterial ancestor of chloroplasts. Protists: singled-celled and colonial eukaryotic microbe other than fungi; include many diverse clades of algae and protozoa. Protozoa: protists that are single-celled heterotrophs; include environmental consumers, & medically impt. parasites dec. Primary endosymbionts: algae derived from a single endosymbiotic event (plant and algae ancestors engulfed cyanobacterium) Secondary endosymbiont: protists that later incorporated algae. Show the greatest range of size and shape of all 3 domains. * some eukaryotes don"t have a functional mitochondria, only remnants. Metamonda amitochondriate, the most ancient eukaryotes. Protozoa combination of free- living groups. Diatoms (silicate (silicon dioxide > glass-like cell wall)) Described by nature of cell wall, motility & feeding. Have pellicle composed of glycoprotein (simple cell wall)
