Study the list of biomolecules given below and choose the option that shows molecules with glycosidic linkages.
Solution:
Glycosidic linkages are covalent bonds formed between carbohydrate molecules (monosaccharides to form disaccharides/polysaccharides) or between a carbohydrate and another molecule (like the sugar and base in nucleosides/nucleotides).
a. Glycogen is a polysaccharide, containing glycosidic linkages.
b. Haemoglobin is a protein, containing peptide linkages.
c. Adenosine is a nucleoside (ribose sugar + adenine base), containing a glycosidic linkage between the sugar and the base.
d. Lactose is a disaccharide, containing a glycosidic linkage between glucose and galactose.
e. Lecithin is a phospholipid (a lipid), containing ester linkages.
Therefore, a, c, and d have glycosidic linkages.