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