This statement is false. While it is true that all cells have a cell membrane and cytoplasm, not all cells contain a nucleus. Prokaryotic cells, such as bacteria, lack a nucleus. Instead of being enclosed within a membrane-bound nucleus, their genetic material is located in a region called the nucleoid. In contrast, eukaryotic cells, which include plant and animal cells, do have a nucleus that houses their genetic material. Therefore, the presence of a nucleus is a distinguishing feature between these two types of cells.
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