chap_15-1

chap_15-1 - Chapter 15, Part I (and pp. 769-770, Evolution...

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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, 26, 27 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 A human adult carries 100g (4 oz) of live bacteria in body!
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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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Power of bacterial genetics is the potential to study rare events Bacteria multiply rapidly – Liquid media – E. coli grow to concentration of 10 9 cells per milliliter within a day – Agar media – single bacteria will multiply to 10 7 – 10 8 cells in less than a day Most studies focus on E. coli – Inhabitant of intestines in warm blooded animals
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This note was uploaded on 02/03/2011 for the course BIOL 2153 taught by Professor Larkin during the Fall '03 term at LSU.

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chap_15-1 - Chapter 15, Part I (and pp. 769-770, Evolution...

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