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BACTERIA AND VIRUSES CONTINUED Prokaryotes are very small and live in colonies of up to trillions Prokaryotes in the soil help to decompose dead organisms and other organic waste material, returning vital chemical elements to the environment Prokaryotes are classified as bacteria or archea External Structure of Prokaryotes o Most important feature is cell wall-> maintains cell shape, provides physical protection, prevents cell from bursting in a hypotonic environment (would cause water loss which inhibits reproduction) Motility of prokaryotes o Flagella allow the bacteria and archea to move toward nutrients, other members of their species, or away from a toxic substance Reproduction and adaption I prokaryotes o Reproduce by binary fission Prokaryotes obtain nourishment in many ways: o Source of energy: Prokaryotic phototrophs capture energy from sunlight prokaryotic chemotrophs harness the energy stored in either organic or inorganic chemicals o Source of Carbon:
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This note was uploaded on 12/21/2011 for the course BIO 202 taught by Professor Brooks during the Fall '11 term at UCSB.

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