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1 Lec 6 Chapter 4 ppt Sept 5, 2008 Transport, Cell Membranes and Cell walls Office phone: 231- 9708 LS-1 room 215 2 Cell Morphology and Size Epulopiscium fishelsoni Paramecium MreB + MreB - Bacillus – rod shaped Diplococcus - 2 cocci Strep - cocci in chains Staphylo - clusters or bunches 3 Cell Morphology and Size: Cocci Diplococcus - 2 cocci Strep - cocci in chains Staphylo - clusters or bunches Tetrads – cubes Diplococcus: Strep. pneumoniae Streptococcus species that chains Clusters or bunches Tetrads: Sarcinia
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4 Surface area to volume ratio • The small size of prokaryotic cells affects their physiology, growth rate, and ecology. •Due to their small cell size, most prokaryotes have the highest surface area–to– volume ratio of any cells. •This characteristic aids in nutrient and waste exchange with the environment. • Are nanobacteria real??? – generally considered less than 200 nanometers in size 5 Phylum Nanoarchaeota or Euryarchaeota phylum : Nanoarchaerum equitans – Riding the fire sphere “dwarf archaea” Hyperthermophile found in association with archaea hyperthermophile Ignicoccus: energy and carbon parasite or symbiont Small genome of 500,000 bases – 400 nanometer cell size, it is one of smallest known living organism .
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This note was uploaded on 02/11/2009 for the course BIOL 2604 taught by Professor Sldaniel during the Spring '08 term at Virginia Tech.

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