Which type of cell contains a membrane-bound nucleus?

A eukaryotic cell is characterized by the presence of a membrane-bound nucleus, which separates the cell's genetic material from the cytoplasm. This is a defining feature of eukaryotic cells, distinguishing them from prokaryotic cells, which do not have a membrane-bound nucleus and instead have their genetic material located in a region called the nucleoid. Eukaryotic cells encompass a wide range of organisms, including plants, animals, fungi, and protists.

While animal cells are a subset of eukaryotic cells and also contain a membrane-bound nucleus, the term "eukaryotic cell" more broadly includes all types of eukaryotic organisms. Bacterial cells, on the other hand, are classified as prokaryotic cells and lack a membrane-bound nucleus, as mentioned earlier. Therefore, the most accurate choice that encompasses the essential characteristic of having a membrane-bound nucleus is indeed the eukaryotic cell.