he quaternary structure of hemoglobin changes from the T state to the R state ________.Answers: A. only after four molecules of oxygen are boundB. only after three molecules of oxygen are boundC. when hemoglobin is completely deoxygenatedD. when at least one subunit on each dimeric unit (αβ dimer) is oxygenated
Question
he quaternary structure of hemoglobin changes from the T state to the R state ________.Answers: A. only after four molecules of oxygen are boundB. only after three molecules of oxygen are boundC. when hemoglobin is completely deoxygenatedD. when at least one subunit on each dimeric unit (αβ dimer) is oxygenated
Solution
The correct answer is D. "when at least one subunit on each dimeric unit (αβ dimer) is oxygenated".
Hemoglobin is a tetrameric protein composed of two αβ dimers. The transition from the T (tense) state to the R (relaxed) state occurs when at least one subunit on each dimeric unit is oxygenated. This is due to the cooperative binding of oxygen to hemoglobin, where the binding of one oxygen molecule increases the affinity of the remaining subunits for oxygen. This allows for efficient oxygen delivery to tissues.
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