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Model 1 defines the code scientists have discovered that relates the nucleotide sequence of mrna to the amino acid sequence of polypeptides.
a. what do the letters u, c, a, and g in model 1 represent

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zebrius
Letters U, C, A and G represent the nucleotides comprising the mRNA molecule. During the process called translation, a specific mRNA molecule (called messenger mRNA) is decoded into a specific amino acid chain, a polypeptide. For every triplet of nucleotides, a specific amino acid is encoded. The table of Model 1, shows that every triplet is comprised of these four nucleotides in different combinations. 

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