Q
which amino acid does not have a chiral center
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Most amino acids possess a chiral center, which is a carbon atom bonded to four different groups, allowing for isomers that are mirror images of each other. This property is significant because it contributes to the diversity and functionality of proteins. However, one exceptional amino acid that does not have a chiral center is glycine. The reason behind this is that glycine's side chain is a hydrogen atom. In the general structure of amino acids, the central carbon (alpha carbon) is bonded to a hydrogen atom, an amino group, a carboxyl group, and a variable side chain (R group). For all other amino acids, the R group is different from hydrogen, which introduces chirality. Glycine, having two hydrogen atoms attached to the alpha carbon, lacks the structural diversity needed for a chiral center, making it the simplest and only achiral amino acid in the standard set of twenty.
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