At the chemical level, the DNA of prokaryotic cells, which have no nuclear membranes, and that of eukaryotic cells, which have separate, membrane-enclosed nuclei, is identical. DNA is a long, double-stranded molecule containing a backbone of repeating, alternating sugar and phosphate units.
Simple cuboidal epithelium is a type of epithelial tissue found in the body. It is a single layer thick and made of cube-shaped cells. This type of tissue is found lining parts of the body such as the kidney tubules and walls of respiratory bronchioles.
Squamous cells are flat and scale-like; cuboidal cells are cube shaped; and columnar cells are tall and rectangular, like the columns of a building. So, with that said, I'm sure you are wondering how pseudostratified columnar epithelium fit into this classification structure.