ARCHAEA OUTLINE q Definition of Archaea q Structure

ARCHAEA

OUTLINE q. Definition of Archaea q. Structure of Archaea q. History of Archaea q. Environments and Habitats of Archaea q. Archaea and Bacteria Comparison q. References

OUTLINE q. Definition of Archaea Structure of Archaea History of Archaea Environments and Habitats of Archaea and Bacteria Comparison References

Definition of Archaea are organisms consisting of a single cell without a nucleus and with distinct structural. They inhabit a wide range of habitats, including extreme environments. Archaea form one of the three domains of life; the others are bacteria and eukaryotes.

OUTLINE Definition of Archaea q. Structure of Archaea History of Archaea Environments and Habitats of Archaea and Bacteria Comparison References

Structure of Archaea Like bacteria, Archaea have no internal membranes and their DNA exists as a single loop called a plasmid and lack a defined nucleus. Archaea may have one or more flagella attached to them, and an outer cell membrane. Archaea can be spherical, rod, spiral, lobed, rectangular or irregular in shape. An unusual flat.

Structure of Archaea

Structure of Archaea

OUTLINE Definition of Archaea Structure of Archaea q. History of Archaea Environments and Habitats of Archaea and Bacteria Comparison References

History of Archaea The scientific community was understandably shocked in the late 1970 s by the discovery of an entirely new group of organisms, the Archaea. However, biochemically and genetically, they are as different from bacteria as humans are.

History of Archaea Because of this vast difference in genetic makeup, Dr. Carl Woese proposed that life be divided into three domains: � Eukaryota � Eubacteria � Archaebacteria. He later decided that the term Archaebacteria was a misnomer, and shortened it to Archaea.

History of Archaea

OUTLINE Definition of Archaea Structure of Archaea History of Archaea q. Environments and Habitats of Archaea and Bacteria Comparison References

Environments and Habitats of Archaeans may be the only organisms that can live in extreme habitats. However, Archaeans are not restricted to extreme environments; new research is showing that Archaeans are also quite abundant in the plankton of the open sea.

Environments and Habitats of Archaeans include inhabitants of some of the most extreme environments on the planet: 1. 2. 3. 4. 5. In the deep sea at temperatures well over 100 degrees Centigrade. Hot springs. Extremely alkaline or acid waters. Anoxic mud's of marshes. The bottom of the ocean.

Environments and Habitats of Archaea

OUTLINE Definition of Archaea Structure of Archaea History of Archaea Environments and Habitats of Archaea q. Archaea and Bacteria Comparison References

Archaea and Bacteria Comparison ARCHAEA BACTERIA Ribosomes Present Cell wall Pseudopeptidoglycan Peptidoglycan / Lip polysaccharide Habitat extreme and harsh environments like hot springs, salt lakes. found in soil, hot springs, radioactive waste water, Earth's crust, organic matter. Growth & Reproducti on Archaea reproduce asexually by the process of binary fission, budding and fragmentation. Eubacteria reproduce asexually through binary fission, budding, fragmentation.

� Size Archaea and Bacteria Comparison and shape : Both Archaea and Eubacteria found occurring as rods, cocci, spirals, plates, or coiled.

OUTLINE Definition of Archaea Structure of Archaea History of Archaea Environments and Habitats of Archaea and Bacteria Comparison q. References

References www. presentationszone. com www. ucmp. berkeley. edu http: //microbiologyonline. org www. britannica. com www. nature. com www. diffen. com http: //eol. org