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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Definitions:

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