Prokaryotes are chiefly defined as cells without a nucleus to contain the genetic information. Bacteria do not have a nucleus but, like prokaryotes, a nucleoid region in the center where the DNA can be found. Bacteria also do not have membrane-bound organelles, but they do have ribosomes to synthesize proteins. Bacteria vary a lot in the different structures they can have, but these basic factors make bacteria prokaryotes.
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Bacteria are placed in the kingdom Prokaryotes because they lack a true nucleus and membrane-bound organelles, and they typically reproduce asexually. Their genetic material is found in a nucleoid region, consistent with prokaryotic cell characteristics. These features distinguish them from eukaryotic organisms, which have a more complex cellular structure.
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