Each of the three major kinds of RNA has a specific role in protein
synthesis and is produced in the nucleus from DNA. Messenger
RNA (mRNA) is a linear strand that carries a set of genetic instructions
for synthesizing proteins to the cytoplasm. Transfer
RNA (tRNA) picks up amino acids in the cytoplasm, carries
them to ribosomes, and helps position them for incorporation into
a polypeptide. Ribosomal RNA (rRNA), along with proteins,
makes up ribosomes.
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