Question

a peptide contains amino acids Phe,Gly Met,Ala, and Ser. N-terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the petapeptide yielded the dipeptides Gly-Ser, Ala-Gly, and Ser-Met. The peptide sequence is what?

Ala-Gly-Ser-Phe-Met
Ala-Gly-Ser-Met-Phe
Phe-Ser-Gly-Met-Ala
Phe-Met-Ser-Gly-Ala
Phe-Ala-Gly-Ser-Met