If we come across a recently synthesized living system what do we expect it to look like? It is certain that the cell as we know today would not have been synthesized under natural conditions, to begin with, because the cell as we know it today has acquired this shape by evolution during all the 3.2 billion years, after it was synthesized for the first time. Hence we believe that the earlier  living cell must have had a very simple internal structure and must have been only the precursor of the present day cellular life, with a very simple internal structure and full of properties of biological order.

How was such a system synthesized under natural conditions is the most important question of the problem of origin of life. The new course of investigation with this modern concept of molecular evolution preceding the formation of the earlier cell is the result of thinking of a number of scientists. In the environment which completely lacked any living system the first unit to appear should have available a suitable source of energy for formation.

 

Solar energy has always been available on earth and the synthesis brought about by sunlight is more pertinent  to the problem of origin of life. Hence the important question is to find out the weakest source of energy which is strong enough to effect  the desired abiogenesis and then the abiogenic product will have greater chances of survivial. Thus sunlight induced abiogenesis is quite significant in the study of synthesis of  biochemicals which perhaps formed the earlier cells.

 

Hence the first molecules constituting  the earlier cells were synthesized under natural conditions by a slow process of  Molecular evolution and these molecules then organized into the first molecular system with the property of biological order..