試題詳解

6. Human blood plasma contains about 7% protein. These plasma proteins have pK values close to 4 or 5. In the test tube, these proteins will form an insoluble precipitate after all of the following treatments except
(A)Boiling the serum for 5 minutes
(B) Adding sodium chloride to a concentration of 35%
(C) Adjusting the pH to 4.5
(D) Boiling the serum with 6 N hydrochloric acid for 10 hours
(E) Mixing one volume of plasma with two volumes of pure alcohol