The Fundamental Unit of Life — Science STD 9 — Question

The nucleus is a membrane-bound most important part of the cell.
It controls the cellular activities and thus called the brain of the cell.
It contains most of the cell's genetic material, organized as multiple long linear $DNA$ molecules in complex with a large variety of proteins, such as histones, to form chromosomes and also provides the site for the synthesis of t$RNA$ and m$RNA.$