3. By adding SDS (sodium dodecyI sulfate) during the electrophoresis of proteins, it is possible to:
(A) determine a protein's isoelectric point.
(B) dctermine an enzyme's specific activity.
(C) determine the amino acid composition of the protein.
(D) separate proteins exclusively on the basis of molecular weight.

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統計： A(1), B(0), C(0), D(1), E(0) #2773353