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mRNA is directly copied from the DNA, so carries the genetic information out of the nucleus, into the cytoplasm. It then binds to a ribosome, which is a combination of rRNA and protein. tRNA's are bound to specific amino acids, and deliver them to the ribosome. Complementary codons (on the mRNA) and anticodons (on the tRNA) match up, which enables the correct sequence of amino acids to be combined by the ribosome. (Certain codons, 3 base pairs, code for specific amino acids). So, all three types of RNA are required for translation to occur. I hope this helps!