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Amino Acids - H atom and an R group(side chain Fig 1 The R...

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Amino Acids Basic Structure The 20 naturally occurring amino acids are built on a common theme. A free amino acid has the general structure shown in Fig. 1 with an amino group, NH2 , at one end and a carboxyl group, COOH , at the other. Each goup is attached to an alpha carbon. Also attached to the alpha carbon is a
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Unformatted text preview: H atom and an R group (side chain) ( Fig. 1) . The R group is the only thing that varies from one amino acid to another ( Fig. 2 ). Since the central alpha carbon is asymmetrical there are two possible isomers which are mirror images of each other ( Fig. 3 ) Biological systems use the L isomer....
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