Oparin`s and Halden`s Theory (Biochemical origin of life)
Gradual transformation (transmutation) of inorganic compounds to organic compounds and organic compounds to proto cell (life) is called Biochemical origin of life. Major steps: Chemogeny: It is the process of gradual transformation of inorganic compounds to organic compounds. There are its Five sub-units:- Formation of water, methane, Ammonia and Cynamide. Formation of hydrocarbons. Formation of sugar, amino acids and fatty acids. Formation of oxy & hydroxyl derivatives of hydrocarbons. Formation of purines, pyrimidines and nucleotides. Biogeny: Gradual transformation of organic compounds to protocell (life). 3 Steps are:- Formation of nuclei acids. Formation of co-acervates. Formation of proto cell. Cognogeny: Diversification of protozoa into metazoa and metaphyta and various characters.