Biology XI Content
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.
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