While there are many differences between prokaryotic and eukaryotic cells, one feature that is common to some eukaryotic cells and all prokaryotic cells is the presence of a cell wall. The cell wall is a rigid structure that surrounds the plasma membrane of the cell, providing structural support and protection. In prokaryotes, the cell wall is composed of peptidoglycan, while in eukaryotes, the composition of the cell wall can vary depending on the organism. For example, plants have a cell wall composed of cellulose, while fungi have a cell wall made of chitin. Chromatin material is a feature found only in eukaryotic cells. It refers to the complex of DNA and proteins that make up the chromosomes within the nucleus. The nuclear membrane is also a feature unique to eukaryotic cells. It is a double-membrane structure that surrounds the nucleus, separating it from the rest of the cell. Membrane-bound sub-cellular organelles are another feature that is exclusive to eukaryotic cells. These organelles, such as mitochondria, chloroplasts, and the endoplasmic reticulum, are surrounded by a membrane and perform specific functions within the cell. Prokaryotic cells lack these membrane-bound organelles.