28. The binding of one O₂ to one subunit in the hemoglobin tetramer (a2ẞ2) increases the binding affinity of subsequent O₂ binding to other subunits is achieved via the ________ effect.
(A) allosteric
(B) quantum
(C) hydrophobic
(D) hydrophilic
(E) cooperative

1. 題目解析這道題目考察的是血紅蛋白...