1. Which of the following is not a form of secondary structure? a) alpha helix b) beta strand c) 310 helix d) omega helix e) pi helix
2. Which of the following statements is true? a) All secondary structures are always stabilized by hydrogen bonds within the secondary structure element b) All secondary structures are stabilized by hydrogen bonds
3. Which if the following statements is true? a) All secondary structures are long sections of repeating backbone torsion angles b) Secondary structures vary in length substantially and have repeating backbone torsion angles c) The backbone torsion angles are identical within a given secondary structure element
4. What is the Ramachandran plot? a) A plot of phi angles against psi angles b) A plot of psi angles against phi angles c) A plot of psi angles against omega angles d) A plot of phi angles against chi angles
5. Proline residues are often described as 'helix breakers'. This is because: a) They do not have a sidechain b) They cannot adopt the phi/psi backbone conformation of an alpha helix c) They have no backbone hydrogen so cannot form the stabilizing hydrogen bond
6. Proline residues in beta sheets are generally only found in edge strands. This is because: a) They do not have a sidechain b) They cannot adopt the phi/psi backbone conformation of a beta strand c) They have no backbone hydrogen so cannot form the stabilizing hydrogen bond
7. Which of the following statements is true? a) The disribution of phi/psi angles in the Ramachandran plot is not affected by the resolution of the structure b) Low resolution (less accurate) structures tend to show more outlying phi/psi angles in the Ramachandran plot