Which of the following is NOT a characteristic of eukaryotic cells?

Eukaryotic cells are defined by several key characteristics. One of the most definitive traits is the presence of membrane-bound organelles, including a well-defined nucleus that houses the cell's genetic material (DNA). This distinguishes them from prokaryotic cells, which lack such organelles. The highly organized nucleus in eukaryotic cells is important for the regulation of gene expression and the overall management of cellular activities.

Additionally, eukaryotic cells may have various organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus, which all play critical roles in maintaining cellular function and efficiency.

The presence of cellulose in the cell walls of plant cells is another characteristic associated with eukaryotes, particularly in the context of plant cells. Furthermore, eukaryotic DNA is organized and wrapped around proteins called histones, which helps in packaging the DNA into a manageable structure that fits within the nucleus and plays a role in gene regulation.

Given this understanding, the statement that eukaryotic cells do not have membrane-bound organelles is inaccurate, as the presence of such structures is a hallmark of eukaryotic cell organization.