Stanley Miller and Urey proved experimentally the chemical theory of origin of life

After giving an authentic and widely accepted hypothesis about the origin of life by Oparin and Haldane popularly known as the chemical theory of origin of life. Stanley Miller and Harold C. Urey proved this theory by an experiment. The Miller and Urey experiment  also supported Oparin and Haldane’s  theory. It stated  that life gradually originated from inorganic molecules with the help of amino acids forming first and then they give rise to other biomolecules like proteins, glycoproteins, etc. Stanley and Miller performed an experiment by creating the primitive conditions  in the laboratory. These  conditions were like the  atmosphere of the primitive earth. 

Under the guidance of his professor Harold Urey, Stanley Miller took Methane Ammonia and hydrogen in a 2:1:2 ratio in a two liter flask. Another flask that was filled with boiled water connected with the former flask.

This connection was to continue supply of water vapor through a glass tube.

As Oparin and Haldane demonstrate that the temperature of primitive earth was too high. So He used two tungsten electrodes that were fitted to the larger flask to provide the temperature by the electric discharge.That was created to bring the effect of lightning off the primitive atmosphere.

👌👌Remember This Miler apparatus was also called spark discharge apparatus

The larger flask was connected to a small U shaped tube by means of a straight tube passing through a condenser. The water in the second  flask was heated and the released water vapor was added to the chemical mixture.

When the electrodes were used to spark the temperature that was similar to the  lightning and storm of primitive earth.The water vapors were cooled and the water condensed. This condensed water trickles back in the first water flask in a continuous cycle.

This experiment continued  for about a week. After a week Miller and Urey observed that a dark color liquid was condensed in a U shaped  tube. This liquid was a mixture of simple amino acids like glycine alanine and organic acids.

By this it was proved that first life on earth was like a proteinaceous structure and originated according to the oparin and Haldane hypothesis.