Abstract
This chapter discusses the construction of free amino acids and polypeptide end groups. To construct a free amino acid, the tetrahedral α-carbon is connected to a tetrahedral nitrogen piece and a carboxyl piece. It is also attached to a hydrogen atom and a specific side chain, depending on the amino acid being built. One should remember to attach the side chain in the L-configuration. The tetrahedral nitrogen and carboxyl pieces are also used at the two termini of a polypeptide chain. The tetrahedral nitrogen depicts the N-terminus and the carboxyl group, the C-terminus.
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