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Unformatted text preview: Lecture 7 – Protistans – I A. CHARACTERISTICS 1. Domain Eukarya 2. Kingdom Protista- Evolutionary wise: PLANTS FUNGI ANIMALS (eukarotes) ARCHAEA (prokaryotes) BACTERIA (prokaryote)- Simple plants, simple animals, and simple fungi are protists because protists were first a. Unicellular, colonial, multicellular (single cell colonial multicellular)- Unicellular – the simplest you can be; the organism is that single - Colonial – a group of single-celled organisms; it’s called colonial because the cells are not specialized (no division of labor unlike multicellular); if you break apart colonial organisms they are able to live like single-celled organisms (unlike multicellular)- Multicellular – specialized cells; if you break it apart into single cells they are not capable of living on their own (they can’t perform all the functions a single-celled organism can do) b. Eukaryotic c. Plant-like, animal-like, fungal-like - Because it is thought everything else evolved from protists- Plant-like example: (green algae) • Considered plant-like because algae are photosynthetic- Animal-like example (protozoa) • Proto – “before” • Most protozoa are motile, meaning they can move o Can use flagella (flagellates) o Cilia (ciliates) o Pseudopods (false foot) o Or no organelles- Fungal-like • If you put it on a microscope, you see a hyphae (long, threadlike cells); looks like cotton d. Primarily aqu atic- All organisms started from water – land is considered advanced • Organisms evolved from the water and moved onto land B. EXCAVATES (ana erobic flagellates)- Diplomonads – Giardia (fig. 25-5); they are eukaryotic they are just missing a few things • One or two nuclei (1N); many people think this is the precursor to diploid No mitochondria – this is why they are anaerobic • Has flagella Vacuoles • Beaver fever; giardia is found in streams; animals get this and get diarrhea for weeks and shit in the lake; this can occur in townships (Wilkesboro) and the water has to be boiled- Trichonymphs (fig. 25-5) • No mitochondria (anaerobic) Have Golgi complex • Has flagella • Found in the gut of a termite; termites eat wood but don’t have the enzymes to break down the cellulose. Trichonymph has the enzymes to break cellulose down into sugar (symbiotic: both C. Discicristates (disc-shap ed m e m bran es in the mitochondria)- Euglenoids Euglena (fig. 25-6) • Has a flagellum • Most are photosynthetic (have chlorophylls A and B and have chloroplasts because they are eukaryotic, but the chloroplasts have 3 outer membranes while plants only have 2; this is how -...
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