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Q. Assertion (A) There is the coagulation of egg white on boiling.
Reason (R) Denaturation of protein is occur when its native form is subjected to physical change or chemical change.

Biomolecules

Solution:

When a protein in its native form, is subjected to physical change like change in temperature or chemical change like change in pH, the hydrogen bonds are disturbed.
Due to this, globules unfold and helix get uncoiled and protein loses its biological activity. This is called denaturation of protein. The coagulation of egg white on boiling is the common example of denaturation.