An oligopeptide has the following amino acid sequence: NH 2 -Ala-Glu–Leu–Trp–Tyr-Ser–Gly–Lys–Leu-Ala–Arg-Ala-Phe-Ile-Pro–Gly-COOH a) Estimate the net electric charge of the molecule at pH 8.0 and pH 11.0. b) If the above

An oligopeptide has the following amino acid sequence: NH 2 -Ala-Glu–Leu–Trp–Tyr-Ser–Gly–Lys–Leu-Ala–Arg-Ala-Phe-Ile-Pro–Gly-COOH a) Estimate the net electric charge of the molecule at pH 8.0 and pH 11.0. b) If the above peptide is passed through a cation exchange chromatographic column (that is, the matrix of the column has negative charges) stabilized at pH 8.0, would you expect it to be retained on the column? c) Indicates the number of fragments, and the sequence of each of them, that would be obtained when treating the peptide in question with: i) trypsin, ii) chymotrypsin. Transcribed Image Text: NH2-Ala-Glu-Leu-Trp-Tyr-Ser-Gly-Lys-Leu-Ala-Arg-Ala-Phe-lle-Pro-Gly-COOH