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    ProkaryoteProkaryote

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    fearlove

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    ProkaryoteProkaryote

    Post by fearlove on Wed Nov 30, 2011 3:30 pm

    he prokaryotes (pronounced /proʊˈkæri.oʊts/ or /proʊˈkæriəts/) are a group of organisms that lack a cell nucleus (= karyon), or any other membrane-bound organelles. The organisms that have a cell nucleus are called eukaryotes. Most prokaryotes are unicellular, but a few such as myxobacteria have multicellular stages in their life cycles.[1] The word prokaryote comes from the Greek πρό- (pro-) "before" + καρυόν (karyon) "nut or kernel".[2] Prokaryotes do not have a nucleus, mitochondria, or any other membrane-bound organelles. In other words, neither their DNA nor any of their other sites of metabolic activity are collected together in a discrete membrane-enclosed area. Instead, everything is openly accessible within the cell, some of which is free-floating.[3]
    Prokaryotes belong to two taxonomic domains: the bacteria and the archaea. Archaea were recognized as a domain of life in 1990. These organisms were originally thought to live only in inhospitable conditions

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