insect-world.com

Please enter the wonderful World of Prokaryotes.

Cellular organisms are divided into three domains. These are the domains of eubacteria, archaea and eukaryotes. Eubacteria, or "true" bacteria and archaea are known as prokaryotes, or prokaryotes Monera also summarized. Often the term is used synonymously for bacteria, however, as most prokaryotes, eubacteria.

In prokaryotes are organisms that do not have real, that is surrounded by a double membrane, nucleus have. Your DNA is in ring form in the cytoplasm of the cell before. The absence of the nucleus distinguishes them from eukaryotes. So far, about 1600 different species are known which have conquered the various habitats, including under extreme conditions such as temperature ranges from about 100 ° C or high hydrostatic pressures up to 1000 bar.

Some species have so-called flagella for locomotion. The number and arrangement can differ from species to species, sometimes considerably. They allow them to move either forward or to turn on the spot. Thus, the prokaryotes reach food sources or move out of unfavorable living conditions for them out.

Almost all species have a cell wall, which stabilizes the shape of the cell and protects it. The average diameter of prokaryotes is approximately 0.5.

The reproduction is made on the basis of cell division. The genetic material wid doubled and divided the cell in the middle. The two daughter cells are identical with the previous. Under very favorable conditions, a cell division take place every thirty minutes.

As mentioned above belong to the prokaryotes, the eubacteria and the archaebacteria. The latter are divided into three main groups, the methanogens, halophiles and thermophiles. Methanogens are among the anaerobic bacteria and can not survive in oxygen, but are usually found in marsh gas bubbles. Halophiles require salt and are found among other places at the Dead Sea. Thermophiles are located in areas with temperatures of 60 to 80 ° C, as they occur in the geysers of Yellowstone National Park.

The most frequently occurring prokaryotes, however, the eubacteria, many of which are pathogenic, but also some industrial, such as are used in the production of cheese. The bacteria can be harmful to human tissue by mechanical action or release of toxins.

Blue Magpies Nest: Blue Magpies Nest is a collection of essays and poetry suitable for all the family to read, quarranteed to amuse and stimulate you.