The pentapeptide leucylglycylthreonyltyrosylalanine is first incubated with l-fluoro-2,4-dinitrobenzene (FDNB). When the resulting compound is heated to 110oC for 24 h in the presence of 6 M HCl, the solution will contain:
Select one:
a. one alpha-amino acid labeled by FDNB and an unlabeled tetrapeptide.
b. five alpha-amino acids with only leucine labeled by FDNB.
c. all five alpha-amino acids, each labeled by FDNB.
d. all five alpha-amino acids, but only alanine will be labeled by FDNB.