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In the further process, archaea divided into multiple familiar phyla.

Archaeal cells have single properties which separate them from the other two domains of life, Bacteria, and Eukarya. In the further process, archaea divided into multiple familiar phyla. Categorization is a bit harder because most of it is not been isolated in the laboratory and were only seen by analysis of their nucleic acids in samples from their environment. Both archaea and bacteria are usually the same in size and shape, even though fewer archaea have shapes quite unique that of bacteria, for example, the flat and square-shaped cells of  Haloquadratumwalsbyi.  Regardless of this morphological likeness to bacteria, archaea have genes and quite a few metabolic pathways that are even more very much related to those of eukaryotes, notably for the enzymes involved in transcription and translation. Other aspects of archaeal biochemistry are single, for instance, their dependence on ether lipids in their cell membranes, with archaeols. Archaea use a high amount of energy sources than eukaryotes: these range from organic compounds, such as sugars, to ammonia, metal ions or even hydrogen gas. Salt-tolerant archaea (the Haloarchaea) make use of sunlight as an energy source and additional species of archaea fix carbon, but unlike plants and cyanobacteria, no identified species of archaea does both. Archaea replicate asexually by binary fission, fragmentation, or budding; dissimilar bacteria and eukaryotes, no known species form spores.

Initially, experimental archaea were living in unkind environments such as hot springs and salt lakes with no organisms, but enhanced detection tools led to the finding of archaea in almost every habitat, including soils, oceans, and marshlands. Archaea were also part of the human microbiota in the gut, mouth, and skin.    Archaea are mainly abundant in the oceans, and the archaea in plankton perhaps one of the most plentiful groups of organisms on the planet. Archaea are the main part of Earth’s life and play many roles in the carbon cycle and the nitrogen cycle. No clear examples of archaeal pathogens or parasites are identified, but they are frequently mutualists or commensals. One instance is the methane produce strains that inhabit human and ruminant guts, where their enormous numbers aid digestion. Methanogens are as well used in biogas manufacture and sewage treatment, and biotechnology exploits enzymes from extremophile archaea that can suffer high temperatures and organic solvents. Bacteria  common noun  bacteria , singular  bacterium ) are a kind of genetic cell. They compose a large domain of prokaryotic microorganisms. In broad-spectrum a little micrometers in length, bacteria have a number of shapes, range from spheres to rods and spirals. Bacteria were first life form organism where found on the earth surface and in currently they are most of its habitats. Bacteria live in soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth’s crust. Bacteria also live in symbiotic and parasitic contact with plants and animals. Still, most of the bacteria have not been identified, and only half of the bacterial phyla have species that can be grown easily in the laboratory. According to researchers bacteria is also known as bacteriology, a branch of microbiology.

 There are characteristically 40 million bacterial cells in a gram of soil and a million bacterial cells in a milliliter of clean water. There are around 5×1030 bacteria on Earth, form biomass which exceeds that of all plants and animal. Bacteria are very important in many stages of the nutrient cycle by reproducing nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle contains the decay of dead bodies; in this process, bacteria are responsible for the putrefaction. In the biological community’s immediate hydrothermal vents and cold seeps, extremophile bacteria give the nutrients required to sustain life by converting dissolved compounds, for example, hydrogen sulfide and methane, to energy. According to the data report by researchers in October 2012 and published in March 2013 stated that bacteria increase in the Mariana Trench, this with a depth of up to 11 kilometers is the deepest known part of the oceans. Further researchers reported related studies that microbes increase inside rocks up to 580 meters under the sea floor less than 2.6 kilometers of ocean off the shore of the northwestern United States. In addition to that, a microbe can find anywhere. In any condition, they adapt themselves and also survive where they are.

The well-known idea that bacterial cells in the human body are large in number, human cells by a factor of 10:1 has been debunked. There are about 39 trillion bacterial cells in the human microbiota as coming to life by a “reference” 70 kg male 170 cm tall; 30 trillion human cells are found in the human body. This states that though they do not have the upper hand in actual numbers, it is only by 30%, and not 900%.

The highest number exists in the gut flora and a large number on the skin. The huge majority of the bacteria in the body are rendered harmless by the defensive effects of the immune system, though many are helpful, mostly in the gut flora. On the other hand, several species of bacteria are pathogenic and cause infectious diseases, including cholera, syphilis, anthrax, leprosy, and bubonic plague. The most ordinary fatal bacterial diseases are respiratory infections, with tuberculosis alone killing about 2 million people every year, mostly in sub-Saharan Africa. In urbanized countries, antibiotics are used in farming also to treat human infections. In the making of antibiotic fighting against it is a growing problem. In manufacturing, bacteria are vital in mess curing and the breakdown of oil spills, the creation of cheese and yogurt through fermentation, the healing of gold, palladium, copper and other metals in the mining sector, as well as in biotechnology, and the generating of antibiotics and other chemicals.

 Once regarded as plants constituting the class Schizomycetes, bacteria are now known as prokaryotes. However, cells of animals and other eukaryotes, bacterial cells not contain a nucleus and rarely harbor membrane-bound organelles. Even though the word bacteria usually built-in all prokaryotes, the technical classification altered after the finding in the 1990s that prokaryotes have of two very unusual groups of organisms that progress from an earliest common ancestor. These evolutionary domains are called Bacteria and Archaea.

Difference between Archaea and Bacteria

Above we reflect the difference between the archaea and bacteria and found them superficially different from each other. However, both are single-celled microorganisms and display morphological similarities, but differs in other properties. They even flourish in a different environment and therefore are kept in a different group.

Archaea   form an area of single-celled microorganisms. These microbes ( archaea ; singular  archaeon ) are prokaryotes, which indicate they do not have a cell nucleus. Initially, it was named ad as bacteria, later it came to know as  archaebacteria  (in the Archaebacteria kingdom), but this categorization is out-of-date.

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Archaea are single-cell, simple microorganisms and are able of surviving under hard circumstances. They are considered as the oldest cells, which originate on the earth 4 billion years ago.

Bacteria are also single-cell but have a difficult structure. All types of bacteria except archaea falls under this root.

Archaea are found in a strange environment like in hot spring, ocean depth, salt brine.

They are found anywhere like in the soil, water, living and non-living organisms.

The wall of the cell is called pseudopeptidoglycan .

The wall of the cell is made of peptidoglycan with muramic acid or lipopolysaccharide.

Archaea have either bonds with the branch of aliphatic acids in their lipid membrane.

Eubacteria or bacteria have lipid membrane of ester bond with acids.

Archaea not follow glycolysis or Krebs cycle but uses a related pathway.

Follow the glycolysis pathway and Kreb’s cycle to break down glucose.

Methanogens, Halophiles, Thermoacidophiles.

Archaea replicate asexually by binary fission, fragmentation, or by the budding process.

Bacteria can generate spores which allow them to live in critical condition.

Thymine is missing in the tRNA (transferase RNA).

RNA polymerase is complex and contains 10 subunits.

RNA polymerase is simple and contains 4 subunits.

1.Pyrolobusfumarii. 2.Sulfolobusacidocaldarius. 3.Pyrococcusfuriosus. 4.Methanobacteriumformicum.

1.Streptococcuspneumoniae. 2.Yersiniapestis. 3.Escherichia coli (E.coli). 4.Salmonellaenterica.