Differentiate between the following:
(i) Amylose and Amylopectin
(ii) Peptide linkage and Glycosidic linkage
(iii) Fibrous proteins and Globular proteins
OR
Write chemical reactions to show that open structure of D-glucose contains the following:
(i) Straight chain
(ii) Five alcohol groups
(iii) Aldehyde as carbonyl group

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Detailed Solution

(i) Amylose is water soluble, but amylopectin is water insoluble. Amylose consists of 200 -1000 D - glucopyranose units connected in $α$ - linkage between C₁ of one unit and C₄ of the next water insoluble amylopectin has similar structure to that of amylose except that the chains are branched.
(ii) Peptide linkage is formed between 2 amino acids. It is represented by –CONH-
Glycosidic linkage is formed between two monosaccharides.
It is –C-O-C- type linkage.
(iii) Polypeptide chains are parallel in fibrous protein. In globular protein, polypeptide chains are coiled to form a spherical structure.