Optical rotations of some compounds along with their structures are given below which of them have D-configuration.

(a) I, II, III 

(b) II, III 

(c) I, II 

(d) III

 

Insulin is a globular proteins.

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

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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