Which metal is contained in heme to enable oxygen transport?

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Multiple Choice

Which metal is contained in heme to enable oxygen transport?

Explanation:
Oxygen transport relies on a metal center in the heme group that can reversibly bind O2. The metal in heme is iron, sitting at the center of the porphyrin ring. This iron atom can bind oxygen when in the lungs and release it in tissues, enabling transport throughout the body. Oxygen itself isn’t a metal, and the other metals mentioned have different roles: magnesium is the central metal in chlorophyll, not heme, and zinc participates in various enzymes and structural motifs but does not provide the reversible O2 binding you see in hemoglobin.

Oxygen transport relies on a metal center in the heme group that can reversibly bind O2. The metal in heme is iron, sitting at the center of the porphyrin ring. This iron atom can bind oxygen when in the lungs and release it in tissues, enabling transport throughout the body. Oxygen itself isn’t a metal, and the other metals mentioned have different roles: magnesium is the central metal in chlorophyll, not heme, and zinc participates in various enzymes and structural motifs but does not provide the reversible O2 binding you see in hemoglobin.

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