The human being is often described as plethora of chemical reactions. It is true and not surprising that the human beings has over five thousand different enzymes and contain almost all metals known to mankind. It is rather unbelievable that for every single moment of our life span numerous chemical reactions are involved of which we are never conscious off. The scope of Bio-chemistry as a subject is really enormous, because it deals with all the chemical reactions from how we digest our food to the complex chemical reactions within our brain of how we think.
