Is nh2-chr-cooh a carbohydrate, a fatty acid, an amino acid or a polypeptide?

NH2-CHR-COOH is the general structural molecular formula of an amino acid. Amino acids are known to be the building blocks of proteins. Twenty amino acids are required to make the body's proteins. Nine of these amino acids are called essential amino acids and they are obtained from the food we eat or consume. The other eleven amino acids are called non-essential amino acids that are directly synthesized by the body and may also come from different food sources. 

Amino acids are composed of two functional group; the carboxylic acid group and the amine acid group. These functional groups of atoms in a molecule have their own characteristics during chemical reactions and are independent from the functions of the molecule itself.