What characterizes eukaryotic cells?

Eukaryotic cells are characterized by the presence of a membrane-delimited nucleus, which distinguishes them from prokaryotic cells. This nucleus houses the cell's genetic material (DNA) and is a key feature of eukaryotic cellular organization. The presence of a nucleus allows for a more complex regulation of gene expression and DNA replication processes, contributing to the overall complexity and diversity of eukaryotic life forms.

In addition to a nucleus, eukaryotic cells often contain other membrane-bound organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus, which further enhance their functionality and efficiency in biochemical processes. This structural complexity is an essential aspect of eukaryotic biology, enabling a range of cellular processes that are not possible in prokaryotic cells.

The other choices highlight misconceptions about eukaryotic cells. While it is true that many multicellular organisms are eukaryotic, unicellular eukaryotes, such as amoebae and yeast, also exist. Furthermore, eukaryotic reproduction can occur through both asexual and sexual means, unlike the statement that suggests only asexual reproduction. Lastly, the defining characteristic of lacking a nucleus confidently points to prokaryotic cells