why is the rough er rough?
Rough endoplasmic reticulum is a form of endoplasmic reticulum that is studded with ribosomes. Since it has ribosomes stuck all over it, it has a bumpy appearance and is therefore called rough endoplasmic reticulum. Structure of Rough Endoplasmic Reticulum. Structurally, the rough endoplasmic reticulum looks like a pile of folded paper.