Ribosomes and Rough Endoplasmic Reticulum in Protein Synthesis | Cell Biology #238265 (License: Personal Use)

This educational diagram contrasts two ribosome populations in a eukaryotic cell: free ribosomes dispersed in the cytosol and those studded on the surface of the rough endoplasmic reticulum (RER). The RER’s ribosome-coated membranes facilitate synthesis of secretory, membrane-bound, and organelle-targeted proteins, whereas free ribosomes produce cytosolic proteins. Arrows indicate ribosome movement and functional segregation.

Used in biology textbooks, online learning modules, and lecture slides to teach cellular structure and protein biosynthesis pathways; matches user intent for academic study or science communication.