Which statement is true of the nucleus of a cell

The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle. The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material.

Explanation: Well it's a known fact!

It is the nucleus is the control center of the cell. It directs all activities inside the cell.