(B) Chlorophyll is a magnesium-porphyrin complex. In the structure of the chlorophyll molecule,a single $Mg^{2+}$ ion is coordinated at the center of

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(B) Chlorophyll is a magnesium-porphyrin complex. In the structure of the chlorophyll molecule,a single $Mg^{2+}$ ion is coordinated at the center of the porphyrin ring system. This magnesium ion is held by four nitrogen atoms from the four pyrrole rings of the porphyrin structure.