Tag: the three domains of life

There are three major known groups of Archaebacteria, namely methanogens, halophiles and thermophiles. Halophiles are organisms that thrive in high salt concentrations. Thermophiles are organisms that thrive extreme temperatures. Methanogens are organisms that produce methane gas.

Sambhar Salt Lake is India's largest inland salt lake. It is found in the city of Jaipur, state Rajasthan. Hence, the city is also known as Salt Lake City. The water in the lake comes from the rivers Mendha, Runpangarh, Khandel and Karian. 

Monera is non-nucleated unicellular organisms. They are prokaryotes. They have no membrane-bound organelles such as mitochondria, Golgi complex. They lack a true nucleus. Instead, they have nucleoid, genetic material without a nuclear membrane. Examples include Bacteria, Archaebacteria, Mycoplasma, Blue-Green algae. Out of these, the most primitive of monerans are Archaebacteria.

There are three major known groups of Archaebacteria, namely methanogens, halophiles and thermophiles. Halophiles are organisms that thrive in high salt concentrations. They are found in hypersaline environments like in arid, coastal, deep‐sea, underground salt mines. Thermophiles are organisms that thrive extreme temperatures. 

Marsh gas is also called as biogas. It is also called as methane gas as it primarily consists of methane gas along with hydrogen sulfide and carbon dioxide in minor composition. It is a produced by the decomposition of vegetable matter under water by anaerobic bacteria. Bacteria useful in biogas fermentation are Methanogens. They are found in marshes.

Archaebacteria are unicellular prokaryotic organisms. They include halophiles, thermophiles, methanogens. They are found in extreme habitats like areas with high salt concentration, extremely high temperature, marshy areas. They are non-photosynthetic bacteria. They are the oldest living beings. They are primitive organisms.

Halophiles are bacteria that are found in high salt concentration conditions. Examples include Halobacillus, Halococcus. Bacteria found in hot acidic aerobic conditions are called as thermoacidophiles. Examples include Thermoplasma, Thermococci. Methanogens are organisms that produces methane gas. Example includes Methanococcus. Rickettsiae are obligate intracellular, Gram-negative bacteria found in ticks, lice, fleas, mites, mammals. Example includes Rickettsia rickettsii.

Methanogens belongs to Archeabacteria groups. They are involved in the production of methane gas or marshy gas. They are capable of producing methange gas in marshy areas. Examples include Methanococcus, Methanobacterium.

Domains Archaea contains single-celled microorganisms. These are prokaryotes. They do not have a true nucleus or membrane-bound organelles. They lack peptidoglycan in the cell wall. However, they have some novel features absent in other prokaryotes and eukaryotes. Instead of ester bonds like in prokaryotes and eukaryotes, they have ether bonds connecting fatty acids to molecules of glycerol.