What are the amino acids?

Amino acids are organic molecules that contain both a basic amino group and an acidic carboxyl group linked to an alpha carbon. The alpha-amino acids, in which the amino group is attached to the alpha carbon, are the building blocks of peptides and proteins. The amino acids are commonly classified either as a) neutral, basic, or acidic, or as b) nonpolar, polar and uncharged, or polar and charged; the presence or absence of a charge on the amino acids refers to that at pH 7.0