Which of the following monosaccharides are present as a five membered cyclic structure (furanose structure)? 

(a) Ribose 

(b) Glucose 

(c) Fructose 

(d) Galactose

Insulin is a globular proteins.

Ionisation enthalpy increases in a period. Z dominates over screening effect (s) in a period as Z_eff. increases.

Kindly go through the solution

Histidine is an essential amino acid

Lactose is a disaccharide which is formed by forming C? -C? glycosidic linkage between D-galactose and D- glucose.
Lactose - (Hydrolysis)-> D - galactose + D - glucose