Bio 113 Portfolio
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  • Prion
    • Life Cycles
    • Evolutionary History
    • Kuru
    • Sources
  • Virus
    • Life Cycles
    • Evolutionary History
    • Rabies
    • Sources
  • Bacteria
    • Life Cycles
    • Evolutionary History
    • Pseudomonas syringae
    • Borrelia burgdorferi
    • Sources
  • Archaea
    • Life Cycles
    • Evolutionary History
    • Sulpholobus acidocaldarius
    • Sources
  • Protista
    • Life Cycles
    • Evolutionary History
    • Giardia lamblia
    • Phytophthora infestans
    • Hexacontium enthacanthum
    • Corallina officinalis
    • Discostelium discoideum
    • Sources
  • Plantae
    • Life Cycles
    • Evolutionary History
    • Dicranum polysetum
    • Adiantum aleuticum
    • Ginkgo biloba
    • Pyrus communis
    • Magnolia virginiana
    • Sources
  • Fungi
    • Life Cycles
    • Evolutionary History
    • Lentinula edodes
    • Neurospora crassa
    • Gigaspora gigantea
    • Rhizopus stolonifer
    • Batrachochytrium dendrobatidis
    • Sources
  • Animalia
    • Life Cycles
    • Evolutionary History
    • Euplectella aspergillum
    • Lingula anatina
    • Priapulus caudatus
    • Mellita quinquiesperforata
    • Tachyglossus aculeatus
    • Sources

Evolutionary History

pic (2)

Evolutionary History (2):
  • In the late 1970s, Dr. Carl Woese used RNA sequences to determine the relatedness of microbes
  • He discovered that the prokaryotes can be divided into the vastly different groups of Bacteria and Archaea
  • Methanogens were the first group of archaeans to be distinguished as completely separate from the Bacteria and Eukarya
  • Since the discovery that the methanogens belong to the group Archaea, many other archaeal groups have been found
  • Archaeal cells resemble the cells of bacteria but in many important ways are more like the cells of Eukaryotes
Fossil History (2):
  • Molecular fossils of archaea (in the form of isoprenoid residues) were first reported from the Messel oil shale of Germany
           -Methanogens were the most likely archaeans to have left these chemical "fingerprints"
  • Chemical sediments of archaeans have been found in sediments from the Isua district of West Greenland (the oldest on Earth; they are about 3.8 billion years old)
  • This tells us that archaea appeared on the Earth within one billion years of the planet's formation
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