23. Which statement below about contrasting Hb and Mb is FALSE?
(A)Hb shows sigmoidal, whereas Mb shows hyperbolic oxygen saturation curves.
(B) Hb shows cooperativity, whereas Mb does not.
(C)Hb binds O2 more tightly than Mb.
(D)Oxygen binds to a ferrous ion in both proteins.
(E)Hb-oxygen binding is dependent on physiological changes in pH, whereas Mb-oxygen binding is not.