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What is true of protein glycosylation in the ER?
A. Only proteins phosphorylated on an asparagine residue become glycosylated.
B. Sugar residues are added one at a time by a series of enzymes attached to the ER membrane. C. A block of sugar residues is added to the N-terminal signal sequence, creating a common, N-linked oligosaccharide.
D. Only proteins bearing a dolichol residue become glycosylated.
E. Oligosaccharides are added by an enzyme that has its active site on the lumenal side of the ER membrane.

Respuesta :

Answer: A. Only proteins phosphorylated on an asparagine residue become glycosylated.

Explanation: Protein glycosylation helps in proper folding of proteins, stability and in cell to cell adhesion commonly needed by cells of the immune system. The major sites of protein glycosylation in the body are ER, Golgi body, nucleus and the cell fluid.

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