Archaea (arkeobakteri) is one of the major divisions of living organisms. Although the exact phylogeny still cannot be ascertained for the collection, this collection, Arkea, Eukaryotes and Bacteria is a class that includes three-domain system.

Similar to bacteria, Archaea lack a nucleus. Therefore Arkea is including Prokaryotes. Initially, archaea are included in the kingdom Monera. Archaea habitat in dirty environments, but the Archaea can be found everywhere.

Archaea and bacteria have generally similar cell structure, but cell composition and organization set the archaea apart. Like bacteria, archaea lack interior membranes and organelles. Like bacteria, archaea cell membranes are usually bounded by a cell wall and they swim using one or more flagella. 

Structurally, archaea are most similar to gram-positive bacteria. Most have a single plasma membrane and cell wall, and lack a periplasmic space; the exception to this general rule is Ignicoccus, which possess a particularly large periplasm that contains membrane-bound vesicles and is enclosed by an outer membrane

Archaea reproduce asexually by binary or multiple fission, fragmentation, or budding; meiosis does not occur, so if a species of archaea exists in more than one form, all have the same genetic material

Cell division is controlled in a cell cycle; after the cell's chromosome is replicated and the two chromosomes separate, the cell divides. The chromosomes replicate from multiple starting-points (origins of replication) using DNA polymerases that resemble the equivalent eukaryotic enzymes.

Source from: Wikipedia

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