What is a common characteristic of eukaryotic cells?

Eukaryotic cells are distinguished by their complex organization, which includes the presence of membrane-bound organelles. These organelles, such as the nucleus, mitochondria, and endoplasmic reticulum, perform specific functions vital for the cell's survival and operation. The presence of a nucleus is particularly significant, as it houses the genetic material and regulates gene expression. This contrasts with prokaryotic cells, which lack these membrane-bound structures and have a more simplistic organization.

Being multicellular is not a defining characteristic of all eukaryotic organisms, as many eukaryotes, like yeast and certain protists, are unicellular. Additionally, eukaryotic cells have organelles, which are crucial for cellular processes, making the idea of lacking organelles inaccurate. Therefore, the defining feature of eukaryotic cells is indeed their membrane-bound organelles, allowing for compartmentalization and specialization of cellular functions.