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When O2 Binds to Heme in Hemoglobin, the ____ Ion

Question 40

Multiple Choice

When O2 binds to heme in hemoglobin, the ____ ion is drawn into the plane of the ____ causing a conformational change that is transmitted to adjacent subunits enhancing the ____ for additional O2 binding.


A) Mg2+; globin; planarity
B) Fe3+; heme; folding
C) Mg2+; globin; attraction
D) Fe3+; porphyrin; affinity
E) Fe2+; porphyrin; affinity

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