Question

Differentiate between the following
(i) Amylose and Amylopectin
(ii) Peptide linkage and Glycosidic linkage
(iii) Fibrous proteins and Globular proteins

Answer 1

(i)
a: Amylose is an unbranched chain polymer of D-glucose units. Amylopectin is a branched chain polymer of D-glucose units.
b: Amylose gives a dark blue/black color when iodine solution is added while amylopectin gives a reddish brown color when iodine solution is added.

(ii)
a: Glycosidic linkage is joint monosaccharide units while peptide linkage is joint amino acid units.
b: Glycosidic linkage is formed by the reaction between aldehyde or ketone group and alcoholic groups while peptide linkage is formed by the reaction between amino acids and carboxyl groups.

(iii)
a: Fibrous proteins are generally composed of long and narrow strands and have a structural role whereas globular proteins generally have a more compact and rounded shape and have functional roles

b: Fibrous proteins are generally insoluble in water such as keratin, while globular proteins are usually soluble in water such as insulin.