Enzymes are proteins and are essential to life.
Actually enzymes are necessary for life since it is an enzyme that allows the sperm to enter the ovum. The human immune system depends upon the proper amount of enzymes to function properly. With the beginning of modern medicine over 200 years ago, the influence of enzymes on the metabolic processes was finally discovered. Enzymes reduce the energy required for chemical reactions. From the approximately 12,000 enzymes which regulate life's processes, only about 3,000 are known today .