Which of the following statements surrounding Hemoglobin function is INCORRECT?
A.The ability of hemoglobin to switch between the R and T states allows the protein to maximize loading in tissues with low po2, offloading in tissues with high po2, and maintenance of an oxygen reserve during periods of exertion.
B.The sigmoidal binding curve of oxygen exhibited by Hemoglobin disobeys the Law of Mass Action, since ligand binding alters the receptor and its affinity for subsequent ligand binding events.
C.In conditions of acidosis, a critical His at the a1-b2 interface is protonated, favouring salt bridge formation and maximizing oxygen offloading.
D.Myoglobin shows a hyperbolic binding curve since there is only one heme subunit, preventing the subunit-to-subunit communication afforded by the heterodimeric quaternary structure of hemoglobin.
E.2,3-bisphosphoglycerate is a negative allosteric regulator of Hemoglobin, perventing the T-to-R transition required to switch conformations and alter ligand affinity.
