Final answer:
The nucleus is the largest and most visible organelle in the cell, and it's considered the "control center" because it contains the DNA. It controls the cell's activities and holds the genetic material.
Step-by-step explanation:
The largest and most visible organelle in the cell that is considered the "control center" because it contains the DNA is the nucleus. The nucleus is responsible for controlling the cell's activities and holds the genetic material of the cell. It acts as the command center, regulating the functions and activities of the cell.
Learn more about Functions of the cell nucleus