Which of the following cell types is characterized by the presence of a nucleus?

The presence of a nucleus is a defining feature of eukaryotic cells. Eukaryotic cells are characterized by their complex structure, including membrane-bound organelles such as the nucleus, where the genetic material is enclosed. This allows for more intricate regulatory mechanisms and processing of genetic information compared to cells without a nucleus.

In contrast, prokaryotic cells, which include both bacterial and archaea cells, lack a true nucleus. Their genetic material is typically located in a region called the nucleoid, which is not surrounded by a membrane. This fundamental difference in cellular organization separates eukaryotes from prokaryotes. The presence of a nucleus in eukaryotic cells allows for compartmentalization of cellular processes, which contributes to the diversity and complexity of eukaryotic life forms.