D silk protein e The first and the second choice are both correct 3. The portion of proteins having the highest mobility are a a-helices C peptide bonds. d surface side chains E aliphatic groups 4. Which of the following is most correct a Charged amino acids are never buried in the interior of a protein b Charged amino acids are seldom buried in the interior of a protein c All hydrophobic amino acids are buried when a protein folds d Tyrosine is only found in the interior of proteins e Glycine is rarely found in proteins because it is too destabilizing 5. Disulfide bonds most often stabilize the native structure of a extracellular proteins. b dimeric proteins c hydrophobic proteins D intracellular proteins E multisubunit proteins 6. Buried hydrophobic sidechains in a globular protein fit into a"hole"formed by the sidechains of a 1-3 other amino acid b precisely six other amino acids C 5-7 othe d 9-12 other amino acids E 13-15 other amino acids 7. The most important parameter relating to the energy of a H-bond in protein structure is: a whether it is found in an a-helix or a b-sheet b the angle between donor and accepter, i.e. 1800 +/-20 c the distance between donor and accepter i e. <3.2? D the peptide bond dipole, i.e.-370 D e the planarity of the peptide bond 8. All other things being equal, the free energy of favorable electrostatic interaction between two charges separated by 4?(-4kJ/mol) will a decrease 2-fold at 2? separation. b decrease 4-fold at 2? separationD silk protein. E The first and the second choice are both correct. 3. The portion of proteins having the highest mobility are A a-helices. B b-sheets. C peptide bonds. D surface side chains. E aliphatic groups. 4. Which of the following is most correct: A Charged amino acids are never buried in the interior of a protein. B Charged amino acids are seldom buried in the interior of a protein. C All hydrophobic amino acids are buried when a protein folds. D Tyrosine is only found in the interior of proteins. E Glycine is rarely found in proteins because it is too destabilizing. 5. Disulfide bonds most often stabilize the native structure of: A extracellular proteins. B dimeric proteins. C hydrophobic proteins. D intracellular proteins. E multisubunit proteins. 6. Buried hydrophobic sidechains in a globular protein fit into a "hole" formed by the sidechains of A 1-3 other amino acids. B precisely six other amino acids. C 5-7 other amino acids. D 9-12 other amino acids. E 13-15 other amino acids. 7. The most important parameter relating to the energy of a H-bond in protein structure is: A whether it is found in an a-helix or a b-sheet. B the angle between donor and accepter, i.e. 180° +/- 20°. C the distance between donor and accepter, i.e. <3.2?. D the peptide bond dipole, i.e. - 3.70 D. E the planarity of the peptide bond. 8. All other things being equal, the free energy of favorable electrostatic interaction between two charges separated by 4? (-4kJ/mol) will A decrease 2-fold at 2? separation. B decrease 4-fold at 2? separation