Not so simple after all
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چکیده
Biologists have long thought that the internal workings of prokary otes—the smallest and simplest organisms, including bacteria—are well understood, and have accordingly consid ered eukaryotic organisms and their cells to be more fascinating objects for study. During the past decade, however, the focus of some research has begun to turn back to prokaryotes—particularly because genomic analyses have shown the enor mous flexibility and adaptability of these seemingly simple organisms. Moreover, recent structural research has shown that the cell components of prokaryotes might also be more complex than previously thought. it has long been held that prokary otic cells lack the internal structure and organization of eukaryotic cells, which have various membranebound organelles, such as mitochondria, chloroplasts and the nucleus. indeed, prokaryotes are assumed to be the predecessors of some eukaryotic organelles—permanently captured after a period of endosymbiosis.
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تاریخ انتشار 2008