Answer:
The rough endoplasmic reticulum (RER) is involved in the synthesis, folding, and modification of proteins, particularly those that are destined for secretion or for use in the cell membrane. It has ribosomes attached to its surface, which are responsible for protein synthesis.
The Golgi apparatus is responsible for modifying, sorting, and packaging proteins and lipids into vesicles for transport to their final destinations, either within the cell or outside of it. It is also involved in the synthesis of certain carbohydrates. The Golgi apparatus receives vesicles from the endoplasmic reticulum and modifies their contents before sending them on to their final destination.