A.
Mucins contain predominantly O-linked glycans.
B.
O-linked sugar chains are built up by the stepwise donation of sugars from nucleotide-sugars.
C.
Dolichol-pyrophosphate–oligosaccharide donates all of the sugars found in mature N-linked glycoproteins.
D.
N-acetylneuraminic acid is commonly found at the termini of N-linked sugar chains.
E.
Calnexin retains partly folded or misfolded proteins in the ER until proper folding has occurred.