Quelearn on Instagram: "NEET Notes: Ribosome Structure Ribosomes are essential cellular organelles responsible for protein synthesis. They are composed of ribosomal RNA (rRNA) and proteins, existing in both prokaryotic and eukaryotic cells. Ribosomes have two subunits: a small subunit that reads mRNA and a large subunit that joins amino acids to form polypeptide chains. In prokaryotes, ribosomes are 70S (small 30S and large 50S), while in eukaryotes, they are 80S (small 40S and large 60S). These