Protozoans are eukaryotic cells .
The cell illustrated is of the protozoan known as Paramecium caudatum . A nucleus is inside the cell, often but not always centrally located, and contains the genetic programming information for the cell, that is the DNA . Inside the nucleus is nucleoplasm , a fluid analogous to cytoplasm but located in the nucleus. Also inside the nucleus is a spherical structure called the nucleolus . In the information that follows and at the internet link sites, read about each cell component and study the appearance and function of each type of cell component.