* The Nucleus is an organelle: It's a part of a cell, like the brain of the cell.

* Cheek cells and leaf cells have nuclei: Both types of cells need a nucleus to control their functions.

So, it's not that the nucleus *has* a cheek cell or leaf cell, but rather that both cheek cells and leaf cells *contain* a nucleus.

Think of it this way: You have a brain, and your brain is a part of your body. The nucleus is the brain of the cell, and both cheek cells and leaf cells have them.