Rough Endoplasmic Reticulum

The rough endoplasmic reticulum is involved in synthesizing proteins from the ribosomes attached to its surface.
Where is it: attached to the nuclear envelope, next to the smooth endoplasmic reticulum
What it looks like: once again, is a conglomerate of membrane, tubules, and sacs, and, most importantly, is studded with ribosomes

What it does: assembles proteins from the cytoplasm, folding of proteins, quality control of folded proteins, transfers proteins to the Golgi Apparatus

Here's where I got this info...