Question 8 / 22:  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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Anatomy & Physiology 18 Cardiovascular S. Blood

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Attribution:  OpenStax College. Anatomy & Physiology, OpenStax-CNX Web site. http://cnx.org/content/col11496/1.6/, Jun 11, 2014
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