Porphyrin complexes are among the most important chelating


Porphyrin complexes are among the most important chelating agents in nature. Which statement is correct concerning these?

(a) Hemoglobin can bind up to two O2 molecules.
(b) Myoglobin is a protein that contains four heme groups.
(c) Heme is a porphyrin in which the metal ion is Fe(II).
(d) Chlorophylls are porphyrins that contain Ca(II).

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Chemistry: Porphyrin complexes are among the most important chelating
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