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Public study material · @ReiseNell
Amino Acid Structures
Identify this amino acid structure.
Answer and explanation
Glycine (Gly, G). Nonpolar. Smallest amino acid; flexible because the side chain is hydrogen.
Identify this amino acid structure.
Answer and explanation
Alanine (Ala, A). Nonpolar. A simple nonpolar methyl side chain.
Identify this amino acid structure.
Answer and explanation
Valine (Val, V). Nonpolar. Branched-chain nonpolar amino acid.
Identify this amino acid structure.
Answer and explanation
Leucine (Leu, L). Nonpolar. Hydrophobic branched side chain.
Identify this amino acid structure.
Answer and explanation
Isoleucine (Ile, I). Nonpolar. Branched nonpolar side chain with an extra stereocenter.
Identify this amino acid structure.
Answer and explanation
Methionine (Met, M). Nonpolar. Contains a sulfur in a nonpolar thioether side chain.
Identify this amino acid structure.
Answer and explanation
Phenylalanine (Phe, F). Nonpolar. Aromatic hydrophobic side chain.
Identify this amino acid structure.
Answer and explanation
Tryptophan (Trp, W). Nonpolar. Large aromatic indole side chain.
Identify this amino acid structure.
Answer and explanation
Proline (Pro, P). Nonpolar. Cyclic side chain that restricts backbone flexibility.
Identify this amino acid structure.
Answer and explanation
Serine (Ser, S). Polar uncharged. Polar hydroxyl-containing side chain.
Identify this amino acid structure.
Answer and explanation
Threonine (Thr, T). Polar uncharged. Polar hydroxyl-containing branched side chain.
Identify this amino acid structure.
Answer and explanation
Cysteine (Cys, C). Polar uncharged. Thiol side chain; can form disulfide bonds.
Identify this amino acid structure.
Answer and explanation
Tyrosine (Tyr, Y). Polar uncharged. Aromatic side chain with a polar hydroxyl group.
Identify this amino acid structure.
Answer and explanation
Asparagine (Asn, N). Polar uncharged. Polar amide side chain.
Identify this amino acid structure.
Answer and explanation
Glutamine (Gln, Q). Polar uncharged. Polar amide side chain with one extra methylene compared with asparagine.
Identify this amino acid structure.
Answer and explanation
Aspartate (Asp, D). Acidic. Negatively charged acidic side chain at physiological pH.
Identify this amino acid structure.
Answer and explanation
Glutamate (Glu, E). Acidic. Negatively charged acidic side chain with one extra methylene compared with aspartate.
Identify this amino acid structure.
Answer and explanation
Histidine (His, H). Basic. Basic imidazole side chain that can participate in proton transfer.
Identify this amino acid structure.
Answer and explanation
Lysine (Lys, K). Basic. Basic side chain with a terminal amino group.
Identify this amino acid structure.
Answer and explanation
Arginine (Arg, R). Basic. Strongly basic guanidinium side chain.