The Lewis structure of phenylalanine, one of the 20 amino acids that make up proteins, is drawn below (without lone pairs of electrons). The carbon atoms are numbered for the purpose of this question. (a) What is the geometry around C3 ? (b) What is the O-C-O bond angle? (c) Is this molecule chiral? If so, which carbon atom is chiral? (d) Which hydrogen atom in this compound is acidic? (FIGURE CANNOT COPY) | Numerade

5. Below is the structure of phenylalanine. Why should this amino acid give a yellow color with concentrated nitric acid? What part of the molecule becomes nitrated (i.e., adds a -NO2 group)? CH-COOH NH2 6. Does albumin and casein contain tyrosine? How do you know?

The structure of phenylalanine, one of the 20 amino acids that ... | Filo