Hemoglobin has subunit organization (alpha)2(beta)2 . What statement is NOT correct about hemoglobin?
a. it bindsoxygen reversibly
b. it binds oxygencooperatively
c. it is composedof two types of polypeptides with slightly different primarysequences
d. it could beclassified as a homotetramer
e. it displaysquaternary structure