CH15-1

CH15-1 - Chapter 15, Part I (and pp. 769-770, Evolution of...

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Chapter 15, Part I (and pp. 769-770, Evolution of drug resistance in pathogens) The Prokaryotic Chromosome Chapter 15 problems: 1, 5, 9, 13, 15, 27
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Diversity of bacteria Outnumber all other organisms on Earth 10,000 species identified Smallest = 200 nanometers in diameter Largest = 500 micrometers in length (10 billion times larger than the smallest) Habitats range from land, to aquatic, to parasitic Remarkable metabolic diversity allows them to live almost anywhere
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How much bacteria do we each have living inside of us? 1. 1 gram (.04 oz) 2. 10 grams (.4 oz) 3. 30 grams (1 oz) 4. 100 grams (4 oz)
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Typically 1 double-stranded, circular DNA molecule (some have 2, and some have linear chromosome) Folds into a nucleoid body (no “chromatin”) Bacterial chromosome
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Bacteria multiply rapidly Liquid media – E. coli grow to concentration of 10 9 cells per milliliter within a day Agar media – single bacterium will multiply to 10 7 – 10 8 cells in less than a day.
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This note was uploaded on 11/27/2011 for the course BIOL 12 taught by Professor Kim during the Spring '10 term at LSU.

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CH15-1 - Chapter 15, Part I (and pp. 769-770, Evolution of...

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