Which of the following correctly describes the structure of normal hemoglobin A (Hb A)?
a. Four identical polypeptide chains, each containing two heme groups
b. Two a and two b polypeptide chains, each containing one heme group
c. Conjugated protein with 141 amino acids, containing two atoms of iron
d. Two d and two g polypeptide chains, each containing a single heme group
ANS: B
Hb A is composed of two a and two b chains. Each of these chains contains one heme group.
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