a acids have an amine and a carboxyl group They also have a functional group which is unique to each of them. Depending on the polarity of the functional group the amino acid can be rendered optically inactive or active. The simplest of all amino acids, Glycine which has H as a functional group lacks optical acitivity, as the saturated alpha carbon is unsubstituted. Others among the $20$ amino acids have $D$ or $L$ stereoisomers. So, the correct answer is '$Glycine$'.
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It is best to carry out reactions with sugars in neutral or acid medium and not in alkaline medium. This is because in alkaline medium sugars undergo one of the following changes