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5. Enzymes in action

‘Enzymes in action’ explores a few interesting examples which illustrate the sophistication and subtlety of enzymes in action. One function of the digestive system is to dismantle food proteins, releasing the amino acids for one’s own use. For this, there is a set of enzymes called proteinases. The zymogen is an inactive enzyme precursor that is only ‘switched on’ at the appropriate time so that the potent protein degrading activity appears when, and only when, the food is there to keep it fully occupied in gainful activity.