5. 下列混合物包含 urease (pI = 5.1, mol. wt. 482,700), catalase (pI = 5.6,mol. wt. 247,500), lactoglobin (pI 5.2, mol. wt. 37,100) 及hemoglobin(pI 6.9, mol. wt. 64,500) 四種蛋白質，當用 pH 6.5 buffer通過帶正價的DEAE-cellulose chromatography column 層析管柱後會依序流出，其前後次序為何？
(A) urease, lactoglobin, catalase, hemoglobin
(B) hemoglobin, catalase, lactoglobin, urease
(C) urease, catalase, hemoglobin, lactoglobin
(D) lactoglobin, hemoglobin, catalase, urease
(E)cannot be determined from the information given