Which structures do all eukaryotic cells contain?

All eukaryotic cells contain a nucleus, which houses the cell's genetic material, as well as various organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus. Additionally, they possess a plasma membrane that regulates the movement of substances in and out of the cell. Eukaryotic cells also contain cytoplasm, where many cellular processes occur. These structures collectively contribute to the cell's function and organization.