Which of the following statements correctly compares prokaryotic and eukaryotic cells?

• A. Eukaryotic cells are generally smaller than prokaryotic cells.
• B. Both prokaryotic and eukaryotic cells have membrane-bound organelles.
• C. Prokaryotic cells have a more complex internal structure than eukaryotic cells.
• D. Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus.

Answer: (D)