Please help with all parts and there is table below for reference. Thank you so much!

Table 1. pka values for amino acid side chains and N- and C-terminal groups Amino Acid pk, value Tyr 10.07 Cys 8.18 Lys 10.53 His 6.00 Arg 12.48 Asp 3.65 Glu 4.23 Term. COOH 2.34 Term NH3 9.60 Indicate your selection for each question below. Select only one letter per question. 2 points each oxygen affinity. 1. The structure of hemoglobin is the basis for its A. tertiary; extremely high B. tertiary; adjustable C. quaternary; extremely high D. quaternary; adjustable 2. Which of the following is true for the ligand binding sites of all ligand-binding proteins? A. They are rigid and inflexible. B. They are only composed of amino acid side chains. C. They are structurally and chemically complementary to the ligand. D. They are occupied by prosthetic groups. 3. What protein structural feature is most prevalent in myoglobin and hemoglobin? A. disulfide bonds B. B-sheets C. B-turns D. a-helices 4. What kind of modulator of hemoglobin is BPG? A. Homotropic inhibitor B. Heterotropic inhibitor C. Homotropic activator D. Heterotropic activator 5. In order to have greater than 50% of the binding sites of a protein occupied, the concentration of the ligand should be the Kd of the protein for that ligand. A. greater than B. less than C. equal to