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RNA component of the ribosome, essential for protein synthesis in all living organisms / From Wikipedia, the free encyclopedia
Ribosomal ribonucleic acid (rRNA) is a noncoding type of RNA that acts as the primary building block for ribosomes and the assembly line on which protein synthesis occurs in those ribosomes, essential to all living organisms. Ribosomal RNA is transcribed from ribosomal DNA (rDNA) and then bound to ribosomal proteins to form the specific subunits of ribosomes. More crucially, however, rRNA acts as the physical and mechanical actor that forces mRNA and tRNA through the ribosome to process and translate both into functioning proteins.[1] Ribosomal RNA is the predominant form of RNA found in most cells, as it composes around 80% of cellular RNA despite never being translated into proteins itself. Ribosomes are comprised of approximately 60% rRNA and 40% other ribosomal proteins by mass.