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.