![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
Select the one FALSE statement:
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.