The nucleus and DNA are super important parts of cells. Think of the nucleus as the control center and DNA as the cell's instruction manual.

What the Nucleus Does:

1. Control Center: The nucleus helps manage how genes are used and makes copies of DNA when the cell divides.
2. Storage for Genetic Material: It keeps the cell's DNA safe, which is organized into 46 bundles called chromosomes in humans.
3. Making Ribosomes: Inside the nucleus is the nucleolus, which creates ribosomal RNA (rRNA). This is needed to make proteins.

What DNA Does:

1. Genetic Information: DNA has about 3 billion small parts, called base pairs, that hold the instructions for how to build and keep the living thing healthy.
2. Instructions for Proteins: DNA gives directions that help create proteins. These proteins do many jobs and make up about 20% of what the cell is made of.

In short, the nucleus manages what happens in the cell, while DNA contains the instructions for traits and functions.