CO Binds More Strongly to the Heme Iron Than O₂

question 16

Multiple Choice

CO binds more strongly to the heme iron than O₂ does due to which reason?

• A) CO binds to the heme iron perpendicular to the porphyrin ring, allowing maximum electron orbital overlap between CO and Fe²⁺.
• B) CO weighs less than O₂, therefore binding to the heme iron more easily.
• C) CO binds to the heme iron covalently, while O₂ binds via ionic interactions.
• D) All of the answers are correct.
• E) None of the answers is correct.

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