What structural feature distinguishes the cells of domain Eukarya from those of the two prokaryotic domains?

• A. Lack of ribosomes
• B. Presence of circular DNA
• C. Lack of a cell membrane
• D. Presence of a nucleus

Answer: (D)

Verified step by step guidance

1. Begin by understanding the basic differences between eukaryotic and prokaryotic cells. Eukaryotic cells belong to the domain Eukarya, while prokaryotic cells belong to the domains Bacteria and Archaea.
2. Identify the key structural features of eukaryotic cells. Eukaryotic cells have membrane-bound organelles, including a nucleus, which is a defining characteristic.
3. Contrast this with prokaryotic cells, which do not have a nucleus. Instead, their genetic material is located in a region called the nucleoid, which is not membrane-bound.
4. Consider the options given: 'Lack of ribosomes', 'Presence of circular DNA', 'Lack of a cell membrane', and 'Presence of a nucleus'. Evaluate each option based on your understanding of cell structure.
5. Conclude that the presence of a nucleus is the structural feature that distinguishes eukaryotic cells from prokaryotic cells, as prokaryotic cells lack a true nucleus.