A pentapeptide that contains tryptophan, lysine, proline, serine, and threonine is incubated with trypsin. A dipeptide and a
tripeptide result. The tripeptide contains tryptophan, proline, and serine (not necessarily in that order). A second sample of the
pentapeptide is incubated with chymotrypsin, and following this treatment a tripeptide and a dipeptide result. The dipeptide
contains proline and serine. Finally, a third sample of the pentapeptide is incubated with carboxypeptidase A, and no free amino
acids are liberated. What is/are the possible sequences of the pentapeptide? Select all that apply.
O WSPKT
O WPSTK
O TKWPS
O PSWTK
O TKWSP
O PSKWT