Which statement accurately describes eukaryotic organisms?

• A. They lack a nucleus
• B. They have a nucleus and membrane-bound organelles
• C. They cannot be unicellular
• D. They always perform photosynthesis

Answer: (B)

Eukaryotic cells are defined by having a nucleus and membrane-bound organelles, which keeps genetic material inside a nucleus and creates separate compartments for different cellular tasks. This organization distinguishes them from prokaryotes, which lack a true nucleus and internal membranes. Because of this structure, the statement that accurately describes eukaryotic organisms is that they have a nucleus and membrane-bound organelles. They can be unicellular or multicellular, so being able to be single-celled is not exclusive to eukaryotes. Also, not all eukaryotes perform photosynthesis—many, like animals and fungi, do not.