Five Kingdoms, Three Domains

A five-kingdom system takes into account the differences between prokaryotes and eukaryotes, and it also provides classifications for eukaryotes that appear to be neither plants nor animals. 

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Some biologists prefer a three-domain classification scheme— Bacteria (eubacteria), Archaea (archaebacteria), and Eukarya (eukaryotes)—to the five-kingdom classification (Figure 1.19). The basis for this preference is the emphasis on biochemistry as the basis for classification. 

Recall List the three domains into which living organisms are divided, and indicate how this scheme differs from the five-kingdom classification scheme. 

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