An organism is formed by an enormous number of biomolecules of hundreds of different types. These molecules are the building material and are themselves constructed in great variety and complexity due to specific bonding arrangements.

Classification of Biomolecules:

Biomolecules may be classified as micro molecules and macromolecules.

Micro molecules:

micro molecules are with low molecular weight e.g. glucose, amino acids, fatty acids, etc.

Macromolecules:

Macromolecules are with high molecular weights e.g. starch, proteins, lipids, etc.

Conjugated Molecules:

Two different molecules, belonging to different categories, usually combine to form a conjugated molecule e.g. glycoproteins, lipoproteins, nucleoproteins, etc.