_______________ and _____________ are amino acids that are each represented by only one condon.



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Codons are a linear sequence of three nucleotides in DNA that correspond to a particular amino acid.  They are an important part of protein biosynthesis in the cell.  The DNA is converted to messenger RNA which in turn is converted in the ribosome to a particular sequence of amino acids to make a protein.  The codons denote the specific sequence of amino acids to be put together to make a specific protein.  Since there are 4 different nucleic acids in DNA (and RNA), there are 64 different codons available for about 20 commonly used amino acids.  As a result, most amino acids are represented by more than one codon.  Two amino acids, however, have only one codon to represent them and they are methionine and tryptophan.


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