Answer
Eukaryotic and prokaryotic cells contain many membrane-bounded structures in them that are assigned to perform specialized functions for the normal activity of the cells. These structures are called organelles.
Step-by-step explanation
The eukaryotic cell contains many organelles like endoplasmic reticulum (smooth and rough endoplasmic reticulum), ribosomes, Golgi apparatus and the most important, the nucleus.
Each of these has their particular role and the roles of all these collectively lead to the survival and normal functioning of the cell.