Explain the most valid theory about origin of life on earth. How did Miller and Urey verify the chemosynthesis theory of evolution?
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Answer:
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Explanation:
The Miller–Urey experiment (or Miller experiment) was a chemical experiment ... That is considerably more than what Miller originally reported, and more than the 20 .
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Answer:
The most valid theory about the origin of life on earth is the Oparin-Haldane hypothesis, which is also known as the "Primordial Soup" Hypothesis. Miller and Urey conducted an experiment using methane, ammonia, hydrogen, and water in which they obtained a variety of amino acids and organic acids.
Explanation:
In 1920s Alexander Oparin, a biochemist , and J.B.S. Haldane, a geneticist and evolutionary biologist, independently proposed a hypothesis which said that the first stage in origin of life on earth was the synthesis of simple organic molecules or monomers from inorganic compounds that were present in the earth's early atmosphere (hence, the name "primordial soup"). Because the hypothesis talks about the synthesis of chemicals, it is also known as the chemosynthetic theory of evolution.
The hypothesis proposes that early earth had a reducing atmosphere as there was very little oxygen, but instead was made up of water vapor (H2O), Hydrogen gas (H2), Methane (CH4), and Ammonia (NH3). Methane and ammonia being reducing agents, readily donate their electrons. Thus, in the early earth atmosphere, reduction-oxidation (redox) reactions could have given rise to organic monomers from inorganic molecules in the presence of strong energy sources like heat from the volcanoes, powerful electric discharges in lightning and solar radiations.
In 1953 Stanley Miller, under the guidance of Harold Urey, tested the hypothesis. Miller placed a mixture of methane, ammonia, hydrogen gas and water in a closed system (mimicking the early earth's atmosphere), heated the mixture and circulated it past an electric spark (simulating lightning). After a week's run, Miller discovered that a variety of amino acids (monomers of protein) and other organic acids has been produced, thus verifying the hypothesis.
