Domain of all organisms whose cells have nuclei?

Domain of all organisms whose cells have nuclei?

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

Answer: (A)

Main idea: having a true nucleus defines eukaryotic cells. Domains separate organisms by cellular organization. Prokaryotes lack a membrane-bound nucleus and fall into Bacteria and Archaea. Eukaryotes, with nuclei and other organelles, are placed in the domain Eukarya. Protista is a kingdom within that domain, not its own domain. So the domain that includes all organisms whose cells have nuclei is Eukarya, which includes animals, plants, fungi, and many protists.

Main idea: having a true nucleus defines eukaryotic cells. Domains separate organisms by cellular organization. Prokaryotes lack a membrane-bound nucleus and fall into Bacteria and Archaea. Eukaryotes, with nuclei and other organelles, are placed in the domain Eukarya. Protista is a kingdom within that domain, not its own domain. So the domain that includes all organisms whose cells have nuclei is Eukarya, which includes animals, plants, fungi, and many protists.