E13 - E1 A codon contains three nucleotides Since G and C...

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E1. A codon contains three nucleotides. Since G and C are present at 50% each, if we multiply 0.5 × 0.5 × 0.5, we get a value of 0.125, or 12.5%, of each of the eight possible codons. If we look the codons up in Table 13.2, we would expect 25% glycine (GGG and GGC), 25% alanine (GCC and GCG), 25% proline (CCC and CCG), and 25% arginine (CGG and CGC). E2. A. There could have been other choices, but this template would be predicted to contain a cysteine codon, UGU, but would not contain any alanine codons. B. You do not want to use 35 S because the radiolabel would be removed during the Raney nickel treatment. C. There would not be a significant amount of radioactivity incorporated into newly made polypeptides with or without Raney nickel treatment. The only radiolabeled amino acid in this experiment was cysteine, which became attached to tRNA cys . When exposed to Raney nickel, these cysteines were converted to alanine but only after they were already attached to tRNA cys . If there were not any cysteine codons in the mRNA template, the tRNA cys would not recognize this mRNA. Therefore, we would not expect to see much radioactivity in the newly made polypeptides. E3. The threonine has been changed to serine. Based on their structures, a demethylation of threonine has occurred. In
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E13 - E1 A codon contains three nucleotides Since G and C...

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