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[[Image:Chirality.jpg|180px|right]]

The two isomeric forms ([[enantiomer|enantiomers]]) of [[amino acids]] are known as the D and L forms.<ref name=bydesign>{{cita libro|autor=Dembski, William A|enlaceautor=William Dembski|título=The Design of Life: Discovering Signs of Inteligence in Biological Systems|editorial=The Foundation for Thought and Ethics|ubicación=Dallas|año=2008|página=227-228|isbn=978-0-9800213-0-1}}</ref> 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.<ref>{{citar livro|autor=Sarfati, Jonathan|autorlink=Jonathan Sarfati|título=[[By Design]]|editora=Creation Book Publishers|ano=2008|local=Australia|página=175|isbn=978-0-949906-72-4}}</ref> 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]].

The ''formula mass'' of any compound (ionic or molecular) is equal to the sum of the [[atomic mass|atomic masses]] of its constituent elements. If the compound is molecular, then the terms ''molecular mass'' or ''molar mass'' may properly describe this quantity.

{{Referencias}}

* [http://www.creationontheweb.com/content/view/1719/ Origin of life: the chirality problem by] [[Jonathan Sarfati]]. TJ 12(3):263–266. December 1998

* [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.

{{Biología navcaja}}

[[en:Chirality]]

[[pt:Quiralidade]]