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Which of the 20 standard amino acids is not optically active (chiral) and why? Glycine, because its side chain is unbranched. Alanine, because its side

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Which of the 20 standard amino acids is not optically active (chiral) and why? Glycine, because its side chain is unbranched. Alanine, because its side chain contains only hydrogen. Glycine, because its side chain is a hydrogen atom. Proline, because its side chain forms a covalent bond with the amino group. Alanine, because its side chain is a methyl group

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