tRNA is produced by RNA polymerase III from the nucleus and exported out to the cytoplasm, awaiting for the codon sequence by the mRNA; while mRNA is produced from RNA polymerase II.
mRNA comes from the transcription of RNA from the nucleus of the cell, and tRNA follows the same step; but the major difference between mRNA and tRNA is that tRNA uses different RNA polymerase (III), then exported out to the cytoplasm, once the mRNA carries its codon sequence down to the ribosome made up of rRNA (make up ribosomes; also from nucleus, offering one binding site for one mRNA and three sites for tRNA), tRNA carries out the anticodon to the codons.
tRNA is produced in the similar process from that of the mRNA and rRNA, only using different polymerases. The anticodon and codon match up, producing polypeptide chains of amino acids, which later become proteins.
Another thing to mention, mRNA just writhes away once its sequence is matched up, but tRNA stays in the cytoplasm permanently.
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