You know that insulin is a highly conserved protein within vertebrate species. However, in ducks, there is a pocket of 3 residues quite different from human found within the A-chain. Using the sequence information provided below, answering the following questions a. Knowing the changes in characteristics with respect to the A-chain of insulin in ducks compared to humans, which insulin form (duck or humans) would you expect to have a higher pl? WHY? Be concise. b. Draw the tripeptide portion of duck insulin indicated above and show appropriate protonation state at physiological pH. Indicate the name of each residue under the structure you have drawn. c. Consider the titration curve for the tripeptide portion of human insulin. Indicate how many inflection points would there be on the titration curve for this portion of the protein only and explain what each inflection point represents.