Proteins + Amino acids

• Which is the TRUE classification of the side-chain of the amino acid glutamine?

  Neutral and hydrophilic
• A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of which amino acid?

  Proline
• SDS-PAGE is a common technique used to separate proteins based on their molecular weight.
• The secondary structure of collagen is characterized by a repeating pattern known as a tropocollagen unit.
• Which of the following amino acids absorbs light at 280 nm?

  Tryptophan
• Beer-Lambert Law:

  A=ε⋅l ⋅C

  absorbance (A), molar absorptivity (extinction coefficient, ε), path length (l), and concentration (C).
• A hydrophobic (nonpolar) molecule often travels the furthest on the TLC plate.