Stop codon facts for kids
It is a codon (that is, a sequence of three nucleotides in messenger RNA). It indicates the end of a gene. Similar to how a full stop indicates the end of a sentence, a stop codon signals the end of genetic translation.
They are also called termination codons or chain termination codons. There are three such codons: UAA, UAG and UGA.
Proteins are based on polypeptides, which are unique sequences of amino acids. Most codons in messenger RNA correspond to the addition of an amino acid to a growing polypeptide chain, which may ultimately become a protein. Stop codons indicate the end of this process, and therefore, the end of polypeptide synthesis.
Stop codon Facts for Kids. Kiddle Encyclopedia.