Chirality With Hands
Amino Acid Chirality chirality with hands from http://www.nai.arc.nasa.gov/ A "chiral" molecule is one that is not superposable with its mirror image. Like left and right hands that have a thumb, fingers in the same order, but are mirror images and not the same, chiral molecules have the same things attached in the same order, but are mirror images and not the same. Although most amino acids can exist in both left and right handed forms, Life on Earth is made of left handed amino acids, almost exclusively. No one knows why this is the case. However, Drs. John Cronin and Sandra Pizzarello have shown that some of the amino acids that fall to earth from space are more left than right. Thus, the fact that we are made of L amino acids may be because of amino acids from space. Why do amino ac...
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