In an a helix the carbonyl CO of one amino acid is hydrogen bonded to the amino H N-H of an amino acid that is four down the chain. Structure of an Amino Acid Amino acids are the monomers that make up proteins. Oxygen hydrogen nitrogen and sulfur atoms.
Generally amino acids have the following structural properties.
The second one is a carboxyl group -OOOH. Amino acids are organic compounds that contain amino NH 2 and carboxyl COOH functional groups along with a side chain R group specific to each amino acid. The general structure of a-amino acids is shown in. The others selenocysteine and pyrrolysine use tRNAs that are able to base pair with stop codons in the mRNA during translation.