20. In glycoproteins, the carbokydrate moiety is always attached through the amino acid residues:
(A) asparagine, serine, or threonine.
(B) aspartate or glutamate.
(C) glutamine or arginine.
(D) glycine, alanine, or aspartate.
(E) tryptophan, aspartate, or cysteine.
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In glycoproteins, th...