All amino acids except [a] have an chiral carbon. All amino acids except [b] have a beta carbon.
Question
All amino acids except [a] have an chiral carbon. All amino acids except [b] have a beta carbon.
Solution
[a] Glycine is the only amino acid that does not have a chiral carbon. This is because its side chain is a hydrogen atom, and for a carbon to be chiral, it must be attached to four different groups.
[b] Glycine is also the only amino acid that does not have a beta carbon. This is because the beta carbon is the carbon in the side chain that is attached to the alpha carbon. Since glycine's side chain is a hydrogen atom, it does not have a beta carbon.
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