1)Consider the following disaccharides and say which one is not a reducing sugar

Question

1)Consider the following disaccharides and say which one is not a reducing sugar.

glucose-2-2-fructose

glucose-1-4-fructose

galactose-2-4-glucose

glucose-1-6-glucose

2)Carbohydrates can be connected to proteins in different ways. Examine the options below describing different types of connections that link proteins to carbohydrates. Say which of these linkages are most likely to be involved in connecting glycosaminoglycans to proteins in proteoglycans:

i) O-linkages to Ser

ii) O-linkages to Thr

iii) N-linkages to Asn

i)

ii)

i) and iii)

ii) and iii)

iii)

glucose-2-2-fructose

glucose-1-4-fructose

galactose-2-4-glucose

glucose-1-6-glucose

Explanation / Answer

1. The sugars that can reduce Tollen's Reagent and Fehling's Solution are known as Reducing Sugars

   They contain free aldehydic or ketonic group along with hydroxyl (OH) group on the carbon adjacent to these groups."

The answer is (b).

2.The majority of GAGs (GLYCOSAMINOGLYCANS) in the body are linked to core proteins, forming proteoglycans (also called mucopolysaccharides).

The linkage of GAGs to the protein core, in most but not all proteoglycans, involves a specific tetrasaccharide linker residue forming a structure such as: GAG(n)–GlcA–Gal–Gal–Xyl–Ser–protein.

The tetrasaccharide linker is coupled to the protein core through an O-glycosidic bond to a Ser or Thr residue in the protein.

so, (A) & (B) both are correct.

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