Write the monomers of the following sugars and explain how they are linked.
(i) Sucrose
(ii) Maltose
(iii) Lactose

Explanation

(i) Sucrose :
D - glucose and D - fructose linked by `alpha` - 1, 2 glycosidic bond.
(ii) Maltose :
Two molecules of `alpha` - D - glucose linked by `alpha` - 1, 4 glycosidic bond.
(iii) Lactose :
`beta` - D - glucose and `beta` -D galactose linked by `beta` - 1, 4 glycosidic bond.