CBSE - X - Biology - Heredity and Evolution
There is no conclusive evidence for origin of life from inanimate matter.
The Miller–Urey experiment was an experiment that simulated hypothetical conditions thought at the time to be present on the early Earth, and tested for the occurrence of chemical evolution. At the end of one week of continuous operation, Miller and Urey observed that as much as 10–15% of the carbon within the system was now in the form of organic compounds. Two percent of the carbon had formed amino acids that are used to make proteins in living cells, with glycine as the most abundant. Sugars, lipids, and some of the building blocks for nucleic acids were also formed. After this experiment, several more experiments were conducted. There is no truly "standard model" of the origin of life. Most currently accepted models draw at least some elements from the framework laid out by the Oparin-Haldane hypothesis. As of 2009, no one has yet synthesized a "protocell" using basic components which would have the necessary properties of life. Without such a proof-of-principle, explanations have tended to be short on specifics.
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