two major groups that cells can be grouped into to. These are eukaryotic and prokaryotic cells. All eukaryotic cells contain a plasma membrane, as well as cytoplasm and organelles such as mitochondria, rough endoplasmic reticulum (ER), Golgi apparatus, smooth ER, ribosomes, a nucleus which is surrounded by a double membrane known as the nuclear envelope, and secretory vesicles. There are some eukaryotic cells which contain more organelles as well as theses. Some eukaryotic cells, specifically in plants