1. Abbreviation: Tyr.
2. One-letter code: Y, as in "tYrosine".
3. Molecular mass: 181 daltons.
4. Side-chain (or R-group) features:
   • Formula: -CH₂-phenyl-OH;
   • Category: Hydrophobic;
   • pK_a: 9.7.
     (to produce a phenolate anion)

Spacefill model of L-phenylalanine (F)
Back to Question 7.

1. Abbreviation: Phe.
2. One-letter code: F, as in "Fenylalanine".
3. Molecular mass: 147 daltons.
4. Side-chain (or R-group) features:
   • Formula: -CH₂-phenyl;
   • Category: Very hydrophobic;
   • pK_a: none.

Accessibility statement