試題詳解

34. In the large-scale production of a particular human protein in insect cells, the cDNA corresponding to the protein was modified so that the expressed protein would have six histidine residues at the C-terminus. The purpose of this modification was to
(A) facilitate transfer of the cDNA into the insect cells.
(B) provide a promoter for the transcription of the cDNA in insect cells.
(C) facilitate purification of the expressed protein though binding to an affinity column containing chelated nickel atoms.
(D) prevent degradation of the expressed protein by insect cell proteases.
(E) provide the protein solubility