| Term | Definition |
| Polar uncharged amino acids | Ser, Thr, Asn, Glu |
| Basic Amino Acids | His, Lys, Arg |
| Acidic Amino Acids | Asp, Glu |
| Sulfur containing amino acids | Cys, Met |
| Aliphatic Amino acids | Gly, Ala, Lys, Ile, Val, Pro |
| Alkane Amino acids | Gly, Ala, Lys, Ile, Val, Pro |
| Aromatic amino acids | Tyr, Phe, Trp |
| Charge of basic amino acids at physiological ph | Positively charged |
| Polar uncharged amino acids needing a strong base | Ser, Thr |
| Thr | Has 2 chiral carbons |
| Amino acids with carboxyl groups | Acidic amino acids (Asp, Glu) |
| Cys | Important in disulfide linkages |
| Met | Start amino acid |
| Zwitterions | how amino acids appear at physiological pH; no overall charge |
| Ile, Isoleucine | Has 2 chiral carbons |
| Hydrophobic amino acid classes | Aromatic and aliphatic (alkane) |
| Amino acid enantiomer | L designation |