When you think about a membrane, imagine it is like a big plastic bag with some tiny holes.
Cellulose provides a protected framework for a plant cell to survive. It's like taking a water balloon and putting it in a cardboard box.
Early on, they didn't know about the many different types of fluids in the cell.
If it happens in a cell, chances are the nucleusknows about it. The nucleus is not always in the center of the cell.
The primary functions of chromatin are 1) to package DNA into a smaller volume to fit in the cell, 2) to reinforce the DNA macromolecule to allow mitosis, 3) to prevent DNA damage, and 4) to control gene expression and DNA replication