Ribosomal RNA is produced by nucleolus. Ribosomal RNA associates with a set of proteins to form ribosomes. They physically move along an mRNA molecule, catalyze the assembly of amino acids into protein chains. Additionally, they bind tRNAs and various accessory molecules necessary for protein synthesis. Nucleolus is the structure within the nucleus that is responsible for the formation of these complex structures. The DNA is transcribed into ribosomal RNA precursor molecule which is later processed into mature rRNA.
