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Euryarchaeota (from Ancient Greek εὐρύς eurús, "broad, wide") is a kingdom of archaea. [3] Euryarchaeota are highly diverse and include methanogens, which produce methane and are often found in intestines; halobacteria, which survive extreme concentrations of salt; and some extremely thermophilic aerobes and anaerobes, which generally live at temperatures between 41 and 122 °C.
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. [68] Like bacteria, the cell membranes of archaea are usually bounded by a cell wall and they swim using one or more flagella. [119]
Kingdom monera. They belong to the prokaryote characteristics of kingdom monere. they are unicellular organism. they show different mode of nutrition such as autotrophic, heterotrophic,parasitic; they lack mitochondria; they have few organelles which are not membrane bounds; flagellum serves as the locomotory organ; reproduction is both sexual ...
Combined with the five-kingdom model, this created a six-kingdom model, where the kingdom Monera is replaced by the kingdoms Bacteria and Archaea. [16] This six-kingdom model is commonly used in recent US high school biology textbooks, but has received criticism for compromising the current scientific consensus. [ 13 ]
A cell wall is a structural layer that surrounds some cell types, found immediately outside the cell membrane.It can be tough, flexible, and sometimes rigid. Primarily, it provides the cell with structural support, shape, protection, and functions as a selective barrier. [1]
The cells of plants, algae, fungi and most chromalveolates, but not animals, are surrounded by a cell wall. This is a layer outside the cell membrane, providing the cell with structural support, protection, and a filtering mechanism. The cell wall also prevents over-expansion when water enters the cell. [46] The major polysaccharides making up ...
The cells of most archaeplastidans have walls, commonly but not always made of cellulose. [citation needed] The Archaeplastida vary widely in the degree of their cell organization, from isolated cells to filaments to colonies to multi-celled organisms. The earliest were unicellular, and many groups remain so today.
Excavates were formerly considered to be included in the now obsolete Protista kingdom. [6] They were distinguished from other lineages based on electron-microscopic information about how the cells are arranged (they have a distinctive ultrastructural identity). [4] They are considered to be a basal flagellate lineage. [7]