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The two isomeric forms ([[enantiomer|enantiomers]]) of [[amino acids]] are known as the D and L forms. Enantiomeric molecules are physically and chemically indistinguishable by most of the techniques available and only when probed asymmetrically, for instance, by plane-polarized light can they be distinguished.<ref name=bio /> Although most amino acids (except for [[glycine]], which is non-chiral) can exist in both L and D forms, [[life]] on Earth is made of only L-form amino acids. The L form is found in proteins. The D form is found in only some [[proteins]] that are formed by exotic sea dwelling organisms. No one knows why this is the case, but it offers strong evidence that life was designed rather than the result of random [[Abiogenesis|chemical evolution]].
==Discovery==
In 1848, [[Louis Pasteur]] working as a [[chemist]] with a solution of synthetic ammonium tartrate tetrahydrate contaminated it with a mold and the solution became more optically active as the time passed.<ref>{{cite book|author=Yockey, Hubert P|authorlink=Hubert Yockey|title=Information Theory, Evolution, and the Origin of Life|publisher=Cambridge University Press|location=Cambridge|year=2005|page=
2|isbn=978-0-521-80293-2}}</ref> For the first time anyone had demonstrated chiral molecules.
== Formula Mass ==
* [http://www.icr.org/article/evolution-hopes-you-dont-know-chemistry-problem-wi/ Evolution Hopes You Don't Know Chemistry: The Problem with Chirality] by [[Charles McCombs]], Ph.D.
{{Biology navboxBiología navcaja}}
[[Category:Cell biology]]
[[Category:Genetics]]
