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... wastes simply diffuse out of the blood and into the tubules. Uric acid is essentially harmless because it is insoluble in water. The uric acid leaves, along with the feces, through the anus. ...
Big Bang Theory
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... • In 1969, a meteorite landed in Australia that was 12% water and contained traces of 92 amino acids. • It points to not only the presence of organic compounds in outer space, but also the capacity of such compounds to reach earth. • Fred Hoyle and Chandra Wickramasinghe have argued persistently sin ...
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... - Robert Boyle reinforced the position that all matter was made up of tiny particles. - Antoine Laurent Lavoisier is the “Father of modern chemistry”. He developed a system of naming chemicals. - John Dalton suggest that matter was made up of elements and was the first to put forward the modern theo ...
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Carbon Chemistry PowerPoint
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Class X - Jain Bharati Mrigavati Vidyalaya
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Facilitator Information - Lunar and Planetary Institute

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Hypothetical types of biochemistry



Hypothetical types of biochemistry are forms of biochemistry speculated to be scientifically viable but not proven to exist at this time. The kinds of living beings currently known on Earth all use carbon compounds for basic structural and metabolic functions, water as a solvent and DNA or RNA to define and control their form. If life exists on other planets or moons, it may be chemically similar; it is also possible that there are organisms with quite different chemistries—for instance involving other classes of carbon compounds, compounds of another element, or another solvent in place of water.The possibility of life-forms being based on ""alternative"" biochemistries is the topic of an ongoing scientific discussion, informed by what is known about extraterrestrial environments and about the chemical behaviour of various elements and compounds. It is also a common subject in science fiction.The element silicon has been much discussed as a hypothetical alternative to carbon. Silicon is in the same group as carbon in the periodic table, and like carbon is tetravalent, although the silicon analogs of organic compounds are generally less stable. Hypothetical alternatives to water include ammonia, which, like water, is a polar molecule, and cosmically abundant; and non-polar hydrocarbon solvents such as methane and ethane, which are known to exist in liquid form on the surface of Titan.
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