Messenger RNA (mRNA)
Messenger RNA (mRNA) is the molecular blueprint used by the cell to make proteins from amino acids. In a process called transcription, DNA is copied by a machine called the RNA polymerase to produce a strand of mRNA. mRNA is then released to be translated into an amino acid chain which then becomes a protein when folded.
mRNA consists of four nucleotide building blocks as in DNA, but with uracil used in place of thymine, and has a lifetime of anywhere between a few seconds in bacteria to days in mammals. As with DNA, every three bases, or ‘letters’, make up a codon. And every codon in the strand calls for an amino acid — all of which are joined together to create a polypeptide during translation.comments powered by Disqus