INTRODUCTION OF ENZYME Enzymes are synthesized by the cells of all living organisms. They act like catalysts and accelerate the multitude of metabolic reactions upon which life depends. Without exception, all enzymes are proteins and their catalytic activity depends on the presence of a precise conformational structure in the folded polypeptide chains. Even minor alterations in this structure may result in the loss of activity. Enzymes act on specific substrates. Substrate is a substance on which an enzyme acts and a specific end product/s is/are produced. For example, when amylase (enzyme) acts on starch (substrate) the end products produced are maltose and dextrins. Without enzymes life would not be possible. As the biocatalysts, enzymes occupy central role in health and disease. In health, all physiologic processes occur in an ordered, regulated manner mainly due to the catalytic functions of enzymes, which coordinate numerous metabolic reactions inside the cells. Enzymes play very ...