The quaternary structure of hemoglobin changes from the T state to the R state . A) only after four molecules of O₂are bound B) after the binding of one molecule of O₂causes a change in the primary structure C) when hemoglobin is completely deoxygenated D) when at least one subunit on each dimeric unit αβ dimer) is oxygenated

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Quizplus · Accepted Answer

The quaternary structure of hemoglobin changes from the T (tense) state to the R (relaxed) state when at least one subunit on each αβ dimer is oxygenated, facilitating further oxygen binding.

The Quaternary Structure of Hemoglobin Changes from the T State