The basic structure of an amino acid is shown to the right. There are twenty common amino acids, which differ in the "R" group attached to the central carbon atom. amine- H H₂N-C-C-OH-carboxylic acid R "R" Group The amino acids leucine, alanine, and isoleucine have the following "R" groups: Serine:-CH₂-O-H Alanine:-CH3 Cysteine:-CH₂-S-H 

a) Draw the structure of the "tripeptide" that would be formed by the condensation of the amine and carboxylic acid functional groups of these amino acids, linked together in this order: Serine-Alanine - Cysteine.