1. What are halophilic, thermoacidophilic and methanogen archaebacteria?
2. What are the main ecological roles of bacteria?
Types of Archaebacteria:
Archaebacteria are prokaryotic organisms that are similar to bacteria, but have enough differences to be placed into their own domain. Prokaryotic organisms are made of primitive, simplistic prokaryotic cells that lack the membrane-bound nucleus and many of the organelles found in eukaryotic organisms.
Answer and Explanation:
Halophilic, thermoacidophilic and methanogen archaebacteria are all examples of extremophiles. Extremophiles are archaebacteria that live and thrive in areas that are typically not suited for life forms. Halophiles live in areas of high salt concentrations, such as salt mines and bodies of water like the Dead Sea and the Great Salt Lake. Thermoacidophilic archaebacteria live in very hot, acidic environments such as hydrothermal vents in deep sea areas. Methanogen archaebacteria live in areas without oxygen, and function anaerobically. They produce methane as a result of their form of respiration.
Bacteria play many different ecological roles, including the very important role of decomposers. Bacteria, along with fungi, break down dead and decaying organic matter. In this process, they release important molecules and elements back into the earth to be recycled and reused. Bacteria also play important roles in the process of nitrogen fixation, which occurs in the soil. By this process, atmospheric nitrogen is converted into forms that can be used by plants, and can also be passed along to animals.
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from Microbiology: Help and ReviewChapter 5 / Lesson 21