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A. An organism whose cells each contain a membrane-bound nucleus.
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An organism whose cells each contain a membrane-bound nucleus is the best definition of a eukaryote
There are two categories of cells: prokaryotic and eukaryotic. Prokaryotic cells are cells that lack a membrane-bound nucleus and membrane-bound organelles. Organisms with prokaryotic cells are single-celled organisms such as those classified in the domains Bacteria and Archaebacteria. Examples of prokaryotes include bacteria such as E. coli or cyanobacteria, commonly known as blue-green algae.
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