Answer:
B.)erythrose
Step-by-step explanation:
Oligosaccharides refers to complex structure formed when two or more monosaccharides are bonded together by O-glycosidic bonds. They sucrose,maltose and lactose . the glycosidic bonds in olgosaccharides are catalyzed by a specific enzymes. when oligosaccharide is attached to asparagine through a beta linkage to the amine nitrogen of the side chain, then N-Linked glycosylation is formed
Erythrose which is also known as L-thresose is a tetrose saccharide that has one aldehyde group and also part of aldose family. It has the chemical formula C₄H₈O₄. Erythrose found in all living organism and specifically it is found in blood and also in cartilage tissue. It can also be found in cytoplasm of a living cell.
D-Erythrose belongs to tetrose carbohydrate
Therefore, all of the options are part of the core oligosaccharide side chain in the ER, except ERYTHROSE.