Enzymes called aminoacyl-tRNA synthetases attach the correct amino acid to each tRNA, based on the three-dimensional structure of the tRNA molecule. Other classes of RNA species include microRNAs ...
Within the ribosome, the mRNA and aminoacyl-tRNA complexes are held together closely, which facilitates base-pairing. The rRNA catalyzes the attachment of each new amino acid to the growing chain.
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