【已刪除】63. The carbohydrate moiety is always attached to glycoproteins through _______.
(A) aspartate, glutamate or tyrosine
(B) tryptophan, glutamine or alanine
(C) cysteine, phenylalanine or histidine
(D) asparagine, serine or threonine
(E) valine, leucine or isoleucine
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