Which of the following is true for eukaryotic cells?

Eukaryotic cells are characterized by the presence of membrane-bound organelles, which include structures like the nucleus, mitochondria, endoplasmic reticulum, and Golgi apparatus. This compartmentalization allows for specialized functions within the cell, enhancing its efficiency and complexity. The presence of these organelles is a key feature that distinguishes eukaryotic cells from prokaryotic cells, which lack these structures and do not possess a true nucleus.

In contrast, binary fission is primarily a form of asexual reproduction seen in prokaryotic cells, not eukaryotic cells, where various methods of reproduction such as mitosis and meiosis are more common. Similarly, while some eukaryotic cells do have cell walls (like plants and fungi), not all eukaryotes possess a complex cell wall, and those that do have varying compositions. Furthermore, eukaryotic cells are defined by their nucleus, which serves as a control center for genetic material, contrary to the option indicating they lack a nucleus.