Which of the following statements best describes the structure of a hemoglobin molecule?
A. Hemoglobin is comprised of three globin molecules and one heme group per hemoglobin molecule.
B. Hemoglobin is comprised of four globin molecules, each with their own heme group that binds to and carries oxygen.
C. Hemoglobin is comprised of four globin molecules, each of which contain millions of heme groups.
D. Hemoglobin is comprised of two globin molecules, both with their own heme group that binds to and carries oxygen.
Answer: B
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