UT Knoxville BIOL 140 - Chapter 28-35 (60 pages)

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Chapter 28-35



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Chapter 28-35

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Pages:
60
School:
University of Tennessee
Course:
Biol 140 - Organization/Function of Cell
Organization/Function of Cell Documents

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Chapter 28 Bacteria and Archaea 2011 Pearson Education Inc What organisms are most numerous on Earth 1 Eukaryotes 2 Prokaryotes 2011 Pearson Education Inc What organisms are most numerous on Earth 1 Eukaryotes 2 Prokaryotes 2011 Pearson Education Inc 2011 Pearson Education Inc 2011 Pearson Education Inc The Biological Impact of Bacteria and Archaea The lineages in the domains Bacteria and Archaea are ancient diverse abundant and ubiquitous The oldest fossils found thus far are of 3 5 billion year old bacteria Eukaryotes do not appear in the fossil record until 1 7 billion years later 2011 Pearson Education Inc The Biological Impact of Bacteria and Archaea Only 5000 species of bacteria and archaea have been named and described but biologists are virtually certain that millions exist Over 400 species live in the human digestive tract About 128 species live in the lining of the human stomach Approximately 500 species live in the human mouth Microbiology is the study of microbes microscopic organisms 2011 Pearson Education Inc The Abundance of Prokaryotes About 1013 cells make up your body but living on it are about 1012 bacterial cells on your skin and about 1014 bacterial and archaeal cells in your digestive tract A teaspoon of soil contains billions of microbes Current estimates place the number of living prokaryotes at over 5 x 1030 lined end to end they would stretch longer than the Milky Way 2011 Pearson Education Inc Some Bacteria Cause Disease An infectious disease is one spread by being passed from an infected individual to an uninfected individual Bacteria that cause disease are said to be pathogenic Only a tiny fraction of the bacterial species living on and in the human body is pathogenic The experiments of Robert Koch in the late 1800s became the basis for the germ theory of disease which holds that infectious diseases are caused by bacteria and viruses acellular particles that parasitize cells Koch s postulates confirm a causative link between a specific



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