ribosomal rna - makes up bulk of RNA in a cell- a large molecule made up of thousands of nucleotides - folds into unique 3D conformation made up of many hairpin loops as a result of comp base pairing within rRNA molecule - rRNA binds with ribosomal proteins to form large + small ribosomal subunits during translation, ribosomal subunits assemble to form the ribosome - part of rRNA forms an enzyme known as peptidyl transferase (ribozymes), catalyses the formation of peptide bonds between amino acids during translation - rRNA helps to align mRNA in ribosome so anticodons of incoming aminoacyl-trna molecules can complementary base pair with mRNA codons - rRNA orientates aminoacl-trna in correct position within ribosomal binding sites (APE)

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