Gen Bio II- Prokaryotes Notes

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Unformatted text preview: nce factors •  Virulence plasmids ProkaryoDc Growth •  ProkaryoDc Cell Size & Shape •  Bacteria Cell Structure •  Bacterial Genome •  Growth –  Binary fission –  Growth curve –  Biofilms •  GeneDc Transfer •  Bacteria v. Archaea •  Prokaryotes v. Eukaryotes 11 1/29/14 Binary fission GeneraDon Time Time required for a bacterial cell to grow and divide Dependent on chemical and physical condiDons Figure 6.18 ArithmeDc and Logarithmic Growth Figure 6.19 Logarithmic Growth Curves Figure 6.20 12 1/29/14 A typical microbial growth curve Figure 6.21 AssociaDons and Biofilms •  Biofilm –  A dynamic and diverse community of microorganisms adhered to a surface •  Develop an extracellular matrix •  •  •  •  Adheres cells to one another Allows a_achment to a substrate Sequesters nutrients May protect individuals in the biofilm Figure 6.7 •  Complex relaDonships among numerous microorganisms •  Many microorganisms more harmful as part of a biofilm –  AnDbioDc resistance –  Chronic infecDon A_achment Microcolonies FormaDon Mature biofilm Dispersal 13 1/29/14 ProkaryoDc GeneDc Transfer •  •  •  •  •  Cell Size & Shape Bacteria Cell Structure Genome Growth GeneDc Transfer –  TransformaDon –  ConjugaDon –  TransducDon •  Bacteria v. Archaea •  Prokaryotes v. Eukaryotes GeneDc Transfer •  Horizontal gene transfer –  transfer of genes from one independent, mature organism to another –  donor cell contributes part of genome to recipient cell –  genes can be transferred to the same or different species •  Important in evoluDon of many species •  expansion of ecological niche, increased virulence •  Th...
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