explain the relationship between the sequence of bases in dna and the sequence of amino acids in a polypeptide

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The DNA is ultimately the code for the sequence of amino acids in a polypeptide chain, which forms a protein.  Each grouping of three DNA nucleotide bases is a code for a specific amino acid.  Scientists know which amino acid each DNA sequence codes for; this is called the genetic code.  For example, the DNA nucleotide base sequence CTG codes for the amino acid leucine.

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