2 of 3 3. (15 pts. In the space below, draw the complete amino acid structure (not just the R-group) of those amino acids that have either an amide in their side chain or a guanidino group. Draw these amino acids in the form that would predominate at pH 7. Identify them with their one-letter code. Lastly, carefully circle those atoms in each structure that can be involved in hydrogen bonding at pH 7