The main function of the rough endoplasmic reticulum is the production of

The main function of the endoplasmic reticulum is protein production. This reticulum has ribosomes, which are organelles whose main function is the manufacture of these proteins.

Explanation:

The rough endoplasmic reticulum has several functions in the cell, including the transformation and transport of proteins, especially in carrying them to the Golgi apparatus. This reticulum is also responsible for marking proteins with a signal within the lumen. In synthesis, the rough endoplasmic reticulum is the transport system used by eukaryotic cells for protein movement.