Proteins are complex nitrogenous organic macromolecules found in the living systems. They are essential for the living organisms to perform a large number of biological functions. Based on solubility they are classified into two groups: Fibrous and Globular proteins.
Globular proteins are soluble in water, dilute acids and dilute alkalis. These are highly branched and cross linked condensation products of basic and acidic amino acids.
Examples : Egg albumin, casein of milk.
Enzymes, oxygen carrying proteins and protein hormones are globular proteins.Read more: Fibrous vs Globular Proteins