Questions 1 and 2 are just background for the question i do need help with, DONT answer those. I need help with #3 part A, part B and part C please

1. Draw the complete chemical structure for the following peptide at pH 7.0. Asp-Phe-Cys-Ala 2. Draw the titration curve for the peptide shown in question 2. Assume you are titrating with NaOH. Clearly label values on your Y axis. Using a dashed line, clearly indicate where on the curve pH=pKa. You do NOT need to include peptide structures. 3. Draw the predominant structure (s) that would be present at the following points in your titration curve AND give the overall charge ofthe molecule. You may use a skeleton structure. a. At onset before any NaOH is added b. At the final equivalence point. c. When pH=pKa in your third buffering region