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Report Abuse. mRNA acts as a messenger to tell the cells how to function. DNA is divided in the nucleus into mRNA, then sent out of the nucleus through the nuclear membrane and goes off to ribosomes to create different proteins and control activities within the cell.:). Source(s): Just finished Biology.ÎHabeas CorpusÎ¸ Â· 8 years ago.NA is divided in the nucleus into mRNA, then sent out of the nucleus through the nuclear membrane and goes off to ribosomes to create different proteins and control activities within the cell. :). Source(s): Just finished Biology. ÎHabeas CorpusÎ¸ Â· 8 years ago.
1 Methionine is the only amino acid specified by just one codon, AUG. 2  The stop codons are UAA, UAG, and UGA. They encode no amino acid. The ribosome pauses and falls off the mRNA.  The stretch of codons between AUG and a stop codon is called an open reading frame (ORF).