what are ribosomes
The ribosome (/ËraÉªbÉµËzoÊm/) is a large and complex molecular machine, found within all living cells, that serves as the site of biological protein synthesis (translation). Ribosomes link amino acids together in the order specified by messenger RNA (mRNA) molecules.hen a ribosome begins to synthesize proteins that are needed in some organelles, the ribosome making this protein can become membrane-bound. In eukaryotic cells this happens in a region of the endoplasmic reticulum (ER) called the rough ER.