12.
A:
2,3-Bisphosphoglycerate (BPG) increases the affinity of haemoglobin for oxygen.
B:
Deoxygenated haemoglobin has a higher binding affinity for protons than has oxyhaemoglobin.
C:
Haemoglobin has a higher affinity for oxygen than does myoglobin
D:
One molecule of haemoglobin binds sixteen molecules of oxygen-four per submit
The answer is: B