Organisms vary widely in their ability to metabolize amino acids. Based on metabolic requirements amino acids are grouped as essential amino acids (that must be provided in as nutrient) and non-essential amino acids (biosynthesized in adequate amounts). Except for Glycine, all amino acids occur in two possible optical isomers, called D and L. Because of the two hydrogen atoms at the Alpha-carbon, Glycine is not optically active. The L-amino acids represent the vast majority of amino acids found in proteins, whereas, D-amino a...
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