When End-Group Analysis Was Done on the Protein Insulin, the Results

question 24

Multiple Choice

When end-group analysis was done on the protein insulin, the results indicated that both glycine and phenylalanine were N-terminal amino acids and both asparagine and alanine were C-terminal amino acids. These results indicate that

• A) the experiment was done incorrectly
• B) no conclusions can be drawn
• C) there were impurities in the sample
• D) insulin consists of two polypeptide chains

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