Chapter 27 2.08.08

Chapter 27 2.08.08 - Chapter 27 1 Honors Biology Book Notes...

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Chapter 27 1 Honors Biology Book Notes Chapter 27 – Bacteria and Archaea 2/08/08 - Bacteria and Archaea o Microbes : microscopic organisms o Only small fraction of existing species of bacteria/Archaea have been named/discovered o In terms of total volume of living material on our planet, bacteria/Archaea are dominant life forms o Virtually all members of Archaea/bacteria are unicellular prokaryotes [no membrane-bound nucleus] o Bacteria Cell walls made primarily of peptidoglycan Ribosomes/RNA polymerase are different in structure and function from homologous structures in Archaea/Eukarya Plasma membranes similar to those in Eukarya o Archaea Cell walls made of polysaccharides not found in cell walls of bacteria/Eukarya Unique plasma membranes Ribosomes/RNA polymerase are similar in structure and function to Eukarya o Bacteria/Archaea ancestral to eukaryotes and occupy more diverse habitats o Bacterial Diseases Pathogenic: disease-causing Koch was first scientist to propose that bacteria may cause infectious diseases, had 4 criteria to prove hypothesis Koch’s 4 Postulates (1) Microbe must be present in individuals suffering from disease and absent from healthy individuals (2) Organism must be isolated and grown in pure culture away from host organism (3) If organisms from pure culture injected into healthy experimental animal, disease symptoms should appear (4) Organism should be isolated from diseased experimented animal, again grow in pure culture, and demonstrate by its size/shape/color to be same as original Germ Theory of Disease : laid foundations of modern medicine, holds that infectious diseases are caused by bacteria/viruses Antibiotics : molecules that kill bacteria o Bioremediation : use of bacteria/Archaea to degrade/break down pollutants When certain pollutants get into environment, they decompose very slowly because they are anoxic (lack oxygen) due to fact that
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This note was uploaded on 04/07/2008 for the course BIO 1111 taught by Professor Hassan during the Spring '08 term at Temple.

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Chapter 27 2.08.08 - Chapter 27 1 Honors Biology Book Notes...

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