bio test 2 notes

bio test 2 notes - -Start Test 2-9/15 Ch 19 cont...

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Unformatted text preview: -Start Test 2--9/15- Ch. 19 cont. Prokaryotes: • Bacteria and Archaea Domains • 11,000 Species described, may be 100-1000x that number. • 1 st organisms to appear on Earth, 3.5 billion years ago. o The majority of bacteria causes disease in plants, animals, etc. o The majority of bacteria DO NOT cause disease in homo sapiens. • Cell Wall o Semi-rigid, permeable, made of peptidoglycan (carbohydrate with amino acids attached). Gives bacteria shapes. Design comes from the genome. • Cell Wall Shapes: o Bacilli—rod shaped, Cocci, Spirilla—Spiral shaped. o Capsules and Slime walls Capsules—highly organized, firmly attached to cell well. Slime layer—less organized, loosely attached to cell wall. • Pili o Hair-like structures on surface of bacteria which aid in attachment. • Rotating Flagella • Endospore o Protective “resting” structures, bacteria surrounded by durable cell wall. Resistant to extreme conditions. • Reproduction o Asexual, binary fission. o Sexual in the form of conjugations using plasmids. • Energy sources o Autotrophs using photosynthesis or chemosynthesis. o Heterotrophs including symbiotes. • Diseases caused by bacteria o Gonorrhea, syphilis, tuberculosis, Lyme disease. • Antibiotic Resistance • Bioremediation o Making the environment better for living organisms. Deinococcus Radiodurans • Survive 3000x more radiation than humans. • Tolerate extreme dehydration, heat, and cold. • Used to “chew up” toxic waste • Exxon-Valdez oil spill • “Super Bacterium”-9/20- Salem Witch Trials • IN 1692 Ergotism • Ergots: Fungal resting bondies Ergot grows in rye and other grains. It causes ergotism which can include crawling sensation in the skin, tingling in the fingers, vertigo, ringing in the ears, headaches, hallucination, painful muscular contractions leading to convulsions, vomiting, and diarrhea. All of these symptoms are mentioned in the record of the Salem which trials. Ch. 20 The Fungi Structure • Mycelium: the feeding network of a fungus. (the Body of the fungus) o May be extremely large. o Usually found underground or inside a decaying or living organism. o Composed of a woven mesh of hyphae (chains of cells). • Hyphae: the threadlike filaments of a fungus (all consist of cells, forming a long tube of cells) o Tubular cell wall containing chitin o Surrounds the plasma membrane and cytoplasm. • Chitin A Structural polysaccharide of modified sugarsPolysaccharide = many sugars. • Allow for the movement of material from one cell to another, through the pores that connect the cells together. • Some fungi don’t have a septa, theyre called aseptate(?) • This is the last step in the sexual reproduction of fungus • haploid one copy of each chromosome in the spore • asexual reproduction in a fungus, they can make the same exact type of organism • reproduce sexually gives variation to the next generation and this is needed so that the entire population doesn’t go extinct...
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This note was uploaded on 09/29/2011 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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bio test 2 notes - -Start Test 2-9/15 Ch 19 cont...

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