ABSTRACT
This chapter describes a brief history of early works on enzyme, fundamental view on the enzyme, and some examples to show its importance. In reaction specificity, an enzyme catalyzes a particular transformation of the substrate. Muscular action is controlled by the motor neuron. When the brain asks to move a hand, the signal reaches the muscular cells through the neuronal transmission. The amount of oxygen consumed may be hindered by the contaminating reducing substances. When the electrode is dipped in the glucose-containing solution, the following reactions take place. The X-ray crystallography uses an X-ray beam to illuminate sample, and electron microscope uses an electron beam while light microscope uses visible light. The metabolic pathways are composed of chemical reactions, which are catalyzed by enzyme. Substrate specificity is that an enzyme acts on its restricted substrate. However, enzymes show a different degree of specificity.
