1. Amine R group Alpha Carbon Carboxylic Acid

3. Nonpolar side chains

4. Polar side chains

5. Basic and Acidic side chains

7. Same Protein in acidic and basic environments

8. Isoelectric point, pI: Isoelectric point, pI: The pH at which an amino acid has no net charge: both equal + & - charges Isoelectric environment

11. Amide>>

14. By convention, peptides are written from the left, beginning with the free -NH 3 + group and ending with the free -COO - group on the right. C-terminal amino acid: C-terminal amino acid: the amino acid at the end of the chain having the free -COO - group. N-terminal amino acid: N-terminal amino acid: the amino acid at the end of the chain having the free -NH 3 + group.