please help with explanations

You are a top-noteh biochemist who is on expecition to the Amazon jungle, where you isolate a polypeptide you suspect of heing a growth hormone of a newly discovered species of giant spider. Unfortunately, your poraols imino acid sequencer was roughly treated by the airport baggage handlers and can't provide you with the sequence. However, your other supplies arrive unharmed and ready for use. Being a highly skilled top-noteh biochemist, you preserve and obtain the following data: Your peptide is composed of Gly, Alaz, Lysz, Asp, Ser, Tyr (not its sequencel). Treatment with trypsin yielded a tripeptide with an absorbance at 280nm, a ter-eneptide, and a free Gly. Treatment with dabsyl chloride yields dabsyl-Ser. Treatment with Staph protenses: yields a pentapeptide and a tripeptide with no net charge at pH9. a. What is the sequence of this peptide? b. What form will predominate at pH 5 ? And draw its structure. c. What is the isoelectric point of this peptide? d. What direction will this peptide move in an electric field at pH4 ? e. At what pH range will this peptide have a net formal charge of +1