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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.
Ribosomes are cellular organelles that assemble enzymes and other proteins according to the directions found in the DNA code. Structurally, ribosomes consist of two major subunits. The smaller subunit reads mRNA, and the larger subunit assembles amino acids into a peptide chain that will be folded into a protein.