Describe Stanley and Miller’s experiment and give its significance.

1.	Describe Stanley and Miller’s experiment and give its significance.
Answer» Experimental evidence of chemical evolution/Miller’s experiment ▪ Experiment was performed by S.L. Miller and H.C. Urey in 1953. ▪ Experimental set-up: In a closed flask containing CH₄, H₂, NH₃ and water vapour at 800°C, electric discharge was created. The conditions were similar to those in primitive atmosphere. ▪ Observations: After a week, they observed presence of amino acids and complex molecules like sugars, nitrogen bases, pigments and fats in the flask. ▪ Conclusions:. i. It provides experimental evidence for the theory of chemical origin. ii. It showed that the first non-cellular form of life was created about 3 billion years ago. iii. It showed that non-cellular biomolecules exist in the form of DNA, RNA, polysaccharides and protein.

Answer»

Experimental evidence of chemical evolution/Miller’s experiment

▪ Experiment was performed by S.L. Miller and H.C. Urey in 1953.

▪ Experimental set-up: In a closed flask containing CH₄, H₂, NH₃ and water vapour at 800°C, electric discharge was created. The conditions were similar to those in primitive atmosphere.

▪ Observations: After a week, they observed presence of amino acids and complex molecules like sugars, nitrogen bases, pigments and fats in the flask.

▪ Conclusions:.

i. It provides experimental evidence for the theory of chemical origin.

ii. It showed that the first non-cellular form of life was created about 3 billion years ago.

iii. It showed that non-cellular biomolecules exist in the form of DNA, RNA, polysaccharides and protein.

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