Biology for IGCSE & O level - Transport In Animals (Section 7 - No. 1)

What is the role of iron in the context of hemoglobin?
It is a structural component of the red blood cell membrane.
It helps the hemoglobin bind to oxygen.
It is a catalyst for antibody production.
It is used in blood clotting.

Explanation

Iron allows hemoglobin to bind to oxygen.

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