In hemoglobin, the transition from T state to R state (low to high affinity) is triggered by: A) Fe²⁺ binding. B) heme binding. C) oxygen binding. D) subunit association. E) subunit dissociation.

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The transition from T state (low affinity) to R state (high affinity) in hemoglobin is triggered by the binding of oxygen to the heme group. This oxygen binding drives conformational changes in the protein that ultimately result in the R state.

In Hemoglobin, the Transition from T State to R State