Which structure(s) of proteins remains(s) intact during denaturation process?

Step-by-step solution

The loss in biological activity of proteins due to unfolding of globules and uncoiling of helix is called denaturation of proteins. During the denaturation, primary structure remains intact but secondary and tertiary structures are destroyed. e.g. The coagulation of egg white on boiling, curding of milk caused by bacteria due to formation of lactic acid.