Question

Biomolecules are formed by certain specific linkages between simple monomeric units. Write the names of linkages and monomeric units in the following class of biomolecules.
(i) Starch
(ii) Protein
(iii) Nucleic acid.

Answer 1

1. Starch is a homopolymer composed of D-glucose units held by α-glycosidic bonds. It is known as glucosan or glucan.

2. Proteins on complete hydrolysis (with concen­trated $HCI$ for several hours) yield L-α-amino acids. This is a common property of all the proteins. Therefore, proteins are the polymers of L-α-amino acids.

3. Amino acids are a group of organic compounds containing two functional groups—amino and carboxyl. The amino group ($-N{H}_2$) is basic while the carboxyl group ($-COOH$) is acidic in nature.