Please complete the following in triplicate:

Draw the (flat) structures of the twenty amino acids as they would appear at pH 7.0. Draw ALL atoms. As you write each structure be sure to include:

a) The full name, the three and one letter codes (e.g. Glycine, GLY, G) over each structure.

b) Circle the “R” group in each structure.

c) The pKR if appropriate.