Which domains include prokaryotic organisms?

• A. Bacteria and Archaea
• B. Eukarya and Archaea
• C. Bacteria and Eukarya
• D. Archaea and Protista

Answer: (A)

Prokaryotes are cells that lack a nucleus and other membrane-bound organelles. In the three-domain system, prokaryotic life is found in two domains: Bacteria and Archaea. Eukarya is the domain that includes organisms with a true nucleus and organelles, such as animals, plants, fungi, and many protists. Protista is not a separate domain but a grouping within Eukarya for various eukaryotic organisms. Because only Bacteria and Archaea consist of prokaryotic organisms, that pair is the correct one.