| − | '''α-amino acids''' (α is the Greek letter ''[[alpha]]'') have the general formula '''RCH(NH<sub>2</sub>)COOH'''. There are around 20 naturally occurring α-amino acids which [[polymer]]ise by [[condensation polymerisation]] to form all known [[polypeptide]]s (which form the primary structure of [[protein]]s) in biological organisms during [[gene translation]]. | + | '''α-amino acids''' (α is the Greek letter ''[[alpha]]'') have the general formula '''RCH(NH<sub>2</sub>)COOH'''. There are around 20 naturally occurring α-amino acids which [[polymer]]ise by [[condensation polymerisation]] to form all known [[polypeptides]] (which form the primary structure of [[protein]]s) in biological organisms during [[gene translation]]. |