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Ribosomes consist of two major subunitsâthe small ribosomal subunit reads the mRNA, while the large subunit joins amino acids to form a polypeptide chain. Each subunit is composed of one or more ribosomal RNA (rRNA) molecules and a variety of proteins.
Structure. The ribosome is made up of two parts, called subunits. The larger of the two subunits is where the amino acids get added to the growing protein chain. The small subunit is where the mRNA binds and is decoded.Each of the subunits is made up of both protein and ribonucleic acid (RNA) components.The small ribosomal subunit is made up of one ribosomal RNA (rRNA) and approximately twenty-one proteins in prokaryotes (bacteria) and approximately thirty-three proteins in eukaryotes (mammals).n fact, rRNAs make up most of the mass of the ribosome. The proteins bind to various parts of the rRNAs to fill in the ribosome's structure. A color-coded cryo-EM map of an E. coli ribosome showing the interface between the small (30S) and large (50S) ribosomal subunits.