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Groups of microbiology

الكلية كلية الهندسة     القسم  الهندسة البيئية     المرحلة 1
أستاذ المادة اشواق مخيف سلمان حبيب الجبوري       10/07/2018 16:48:36
Archaea
Archaea were once thought to be a type of bacteria. After extensive research of their DNA and membrane structure, some scientists decided to put them into a separate group - Archaea. Another group of scientists is still not convinced and refers to them as Archaeabacteria.
Archaea are unicellular prokaryotes which make them bacteria-like organisms. Their DNA structure resembles the DNA of eukaryotic cells. Also, the cell walls of Archaebacteria are structurally different from the bacterial ones. Archaea live in environments that would not be suitable for most life forms. They can be found around hot geysers, very salty lakes and on the ocean floor. Because Archaea thrive in such extreme conditions, they are sometimes called organism - extremists or extremophiles. Archaeans can survive these extreme conditions due to their physiology. They synthesis different enzymes that keep their cells from being destroyed by high temperatures, salty or acidic water.
Because of their fondness for extreme environmental conditions, Archaeans are believed to be the first living forms that appeared on Earth when it was still waterless, airless and a scorching hot planet.
Archaeans use different energy sources like hydrogen gas, carbon dioxide and sulphur. Some of them use sunlight to make energy, but not the same way as plants do.
Compared with bacteria, Archaebacterial cell walls are composed of different polysaccharides and proteins, with no peptidoglycan.


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