RNA's Role in Protein Synthesis. Overview. In addition, rRNA, rather than the ribosomal protein, likely comprises the basic functional elements of the ribosome. What does rRNA do in protein synthesis?. (proteins) are synthesized. It turns out that it is actually rRNA, and not a protein. The three roles of RNA in protein synthesis. Messenger RNA (mRNA). The proteins in the two subunits differ, as do the molecules of rRNA. The small. The rRNA molecules have several roles in protein synthesis. First, the 28 s rRNA has a catalytic role. What does ribosomal RNA do? Add your answer. Ribosomal RNA (rRNA). Other evolutionary implications of rRNA stem from its ability to catalyze the peptidyl transferase reaction during protein synthesis. In molecular biology, ribosomal ribonucleic acid (rRNA) is the RNA component of the ribosome, and is essential for protein synthesis in all living organisms. DNA, RNA and Protein Synthesis (Chapter 3) Structure and function of DNA. DNA molecules are incredibly long, but also very thin. In addition to rRNA. Ribosomal RNA (rRNA). perform critical functions in the ribosome that allow protein synthesis to. the main forms of ribosomal RNA settle at slightly. where ribosomal RNA (rRNA). but they consist only of RNA, do not encode any protein and are replicated. The role of RNA in protein synthesis was. RNA is an intermediary between DNA and protein, DNA from the Beginning. the amino acids to the ribosomes for protein synthesis. does not change since.