In this article we will discuss about Electron Transport System (ETS) in living organisms. Catabolism of energy-giving substrates (mostly glucose) up to the stage of pyruvic acid through EMP or EDP yields comparatively small amount of energy in the form of ATP by substrate-level phosphorylation. The anaerobic organisms have to be satisfied with this small amount of energy. But the [...]
The following points highlight the three main heterotrophic reactions operating in different living systems. The reactions are: 1. Reactions in which NADPH2 is Required 2. Reactions Requiring ATP 3. Reactions Requiring no Apparent Energy Source. 1. Reactions in which NADPH2 is Required: Two examples of this type are malic enzyme catalysed CO2 incorporation in pyruvic acid, and synthesis of isocitric [...]
In this article we will discuss about the mechanism of enzyme reaction. In an enzyme-catalysed biochemical reaction, the enzyme molecule binds specifically and reversibly to the substrate molecule resulting in formation and breaking of chemical bonds to produce the product. Thus, there is formation of an unstable enzyme-substrate complex which immediately breaks into the product. This can be simply represented [...]