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.

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Hb and Mb both bind oxygen to a ferrous ion, and Mb shows a hyperbolic oxygen saturation curve. Hb exhibits cooperativity where the binding of one oxygen molecule increases the affinity for subsequent oxygen binding, whereas Mb does not show cooperativity. Hb also displays dependence on physiological changes in pH, while Mb does not. However, Hb and Mb do differ in their binding affinities, with Hb binding oxygen more tightly than Mb.

Which Statement Below About Contrasting Hb and Mb Is FALSE