Final answer:
The nucleus is a vital organelle in eukaryotic cells that contains chromosomes, preserving the genetic material and directing essential cell functions.
Step-by-step explanation:
The nucleus, an organelle found in eukaryotic cells confines the chromosomes, keeping them separated from other components of the cell. This function of the nucleus is central to preserving the integrity of the genetic material, which is organized into chromosomes. These chromosomes contain the DNA that encodes the information to direct ribosome and protein synthesis, as well as all other cellular activities by regulating gene expression.