I need a detailed description of archaebacteria (from it's origin to its use in future etc.)
It would be great if you could send me some links related to the topic n suggest a few videos also.
Asked by deeptivora2000 | 25th Aug, 2016, 10:33: AM
Origin of Archaebacteria:
- It is said that archaebacteria evolved immediately after the origin of life on the Earth.
- They are considered one of the most primitive forms of living organisms
- They live in extreme habitats such as salty areas, hot springs and marshy places and hence are also termed evolutionary relics or living fossils.
General Characters of Archaebacteria:
- Cell wall is non-cellulosic formed of polysaccharaides or proteins.
- Cell membrane lipids are arranged in monolayer. The lipids have long, branched hydrocarbon chains linked to glycerol which enable these forms to tolerate extremes of heat and acidity.
- Characteristic chemical composition enables them to bear extremes of heat and pH.
Classification of Archaebacteria:
Based on the kind of environmental conditions in which archaebacteria survive, they are categorised into three major groups.
- Occur in marshy areas
- Convert CO2 into methane
- Obligate anaerobes
- Used in gobar gas plants for the production of methane and fuel gas
- Also found in the stomach of ruminants
- Examples: Methanobacterium, Methanococcus
- Grow in salt-rich conditions
- Grow in salt pans, sea, salted fish
- They give unpleasant odour and undesirable pigmentation to salt
- Examples: Halobacterium, Halococcus
- Can live in high termperature as well as acidic conditions
- Found in hot sulphur springs (temperature: 80 °C, pH: 2)
- Chemosynthetic in nature
- Examples: Thermoproteus, Thermoplasma
Economic Importance of Archaebacteria:
- Methanogens are used in the generation of gobar gas from dung and sewage to be used as cooking gas.
- Heat resistant thermophilic enzymes and restriction enzymes obtained from thermoacidophiles are used in biotechnology.
- Halophiles are used in bioleaching of poor mines.
- Archaebacteria are used in biosensors.
Answered by Sheetal Kolte | 25th Aug, 2016, 11:39: AM
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