Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During the curdling of milk by lactic acid bacteria, the primary structure of the milk proteins remains intact. Reason (R): The change in pH during curdling causes unfolding of globules and uncoiling of helices, leading to loss of biological activity. In the light of the above statements, choose th

Step-by-step solution

Curdling of milk is a common example of denaturation of proteins caused by a change in pH due to the formation of lactic acid. During denaturation, secondary and tertiary structures of proteins are destroyed because the hydrogen bonds are disturbed, causing globules to unfold and helices to uncoil. This leads to the loss of biological activity. Thus, Reason (R) is true. However, the primary structure, which consists of amino acids linked by strong covalent peptide bonds, remains intact during denaturation. Thus, As