why-cant-free-iron-replace-the-biological-roles-of-myoglobin-and-hemoglobin

Question

Why can't free iron replace the biological roles of myoglobin and hemoglobin?

Accepted Answer

Free iron is too reactive and generates free radicals.

Answer

Free iron is not found in the body.

Answer

Free iron is too large to fit into the heme structure.

Answer

Free iron cannot bind oxygen.