Here's why:
* Nucleus: The nucleus is a defining characteristic of eukaryotic cells. It houses the cell's DNA, which controls the cell's activities.
* Membrane-Bound Organelles: These are specialized structures within the cell that are enclosed by membranes. Examples include mitochondria (for energy production), Golgi apparatus (for protein processing), endoplasmic reticulum (for protein synthesis and lipid metabolism), and lysosomes (for waste breakdown).
In contrast, prokaryotic cells, such as bacteria and archaea, lack a nucleus and membrane-bound organelles. Their DNA is located in a region called the nucleoid, and they have fewer internal compartments.