Use the protein databank to look at the structure of PDB ID 1ZAA and answer the following questions about it. a. What type(s) of macromolecules are present in this structure? b. What type of metal(s) is present in the structure? c. Look at the metal binding site on the PDB (you may select any of the three metal ions). In the space below, paste a screenshot showing one metal binding site. d. Which amino acid side chains are directly coordinating the metal ion? e. For each amino acid you have identified, indicate whether it is a hard, soft, or borderline base according to HSAB. (if we haven't gotten to this in class yet, you won't need to