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7 / 31  A molecule of hemoglobin ________.
A  is shaped like a biconcave disk packed almost entirely with iron
B  contains four glycoprotein units studded with oxygen
C  consists of four globin proteins, each bound to a molecule of heme
D  can carry up to 120 molecules of oxygen

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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