Use 1&2 as background for #5,6 and 7. I only need help with #5,6 and 7. pls and thx

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. 6. Draw the predominant structure of the tetrapeptide at pH=9 and give the overall charge. You may use a skeleton structure. 7. Draw the predominant structure of the tetrapeptide at pH=3 and give the overall charge. You may use a skeleton structure