21. Which of the following statements is incorrect?

A. Protein G contains both a-helix and P-sheet
B. Protein G contains only a-helix
C. Fatty acid binding protein contains largely P-sheet
D. Hemoglobin contains four sub-units

22. The oxygen binding curves of hemoglobin and myoglobin

A. allow maximum transfer of oxygen to the tissues
B. are a consequence of the quaternary structure of hemoglobin
C. both (a) and (b)
D. are identical

23. The nature of peptide bond can be best explained as

A. partial double bond
B. truly double bond
C. Hydrogen bond
D. Van der waals force

24. Which of the following statement is incorrect?

A. Hemoglobin and myoglobin are the two oxygen binding proteins
B. Hemoglobin transports O2 in the blood
C. Myoglobin stores O2 in muscles
D. None of the above

25. Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

A. Delta
B. Epsilon
C. Gamma
D. Alfa