(A) In oxyhemoglobin,the $Fe(II)$ ion is coordinated to four nitrogen atoms of the porphyrin ring,one nitrogen atom from the proximal histidine residu

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(A) In oxyhemoglobin,the $Fe(II)$ ion is coordinated to four nitrogen atoms of the porphyrin ring,one nitrogen atom from the proximal histidine residue,and one oxygen molecule $(O_2)$.Thus,the total coordination number of $Fe(II)$ is $4 + 1 + 1 = 6$.