Question

Question 5. Which of the following pairs of bonds within a peptide backbone show free rotation around both bonds? A) Ca-C and N-C B) C-O and N-C C) C-O and N-Ca D) N-C and Ca-C E) N-Ca and N-C Question 6. In the diagram below, the plane drawn behind the peptide bond indicates the: A) absence of rotation around the C-N bond because of its partial double-bond character. B) plane of rotation around the C-N bond. region of steric hindrance determined by the large C O group. C) region of the peptide bond that contributes to a Ramachandran D) plot. E) theoretical space between -180 and +180 degrees that can be occupied by the and w angles in the peptide bond. Question 7. A sequence of amino acids in a certain protein is found to be -Ser-Gly-Pro-Gly- The sequence is most probably part of a(n): A) antiparallel B sheet. B) parallel B sheet. C) a helix. of tm a D) a sheet. E) B turn. Question 8. Which of the following statements concerning protein domains is true? A) They are a form of secondary structure. B) They are examples of structural motifs. C) They consist of separate polype ptide chains (subunits). D) They have been found only in prokaryotic proteins. E) They may retain their correct shape even when separated from the rest of the protein. bonds has been determined. How could one predict whether there might be secondary structures in my protein once it folds into a native conformation? Question 9. The primary structure of a protein is known and the location of internal disulfide A. Perform X-ray diffraction on my protein B. Perform a Ramachandran plot/analysis on my protein C. Run two-dimensional gel electrophoresis on my protein D. Determine if there is more than one polypeptide in the protein E. Identify specific motifs in the primary structure Question 10. What important function do molecular chaperones perform? A. Assemble protein subunits into a quaternary structure

Answer 1

Amsuoer Opton (A correct n boncls uithin a peptide backbone Ahouo ee aotation paixs Co-C and N- C bonda both aroundl

Answer 2

C=o and N-C

Answer 3

N-C and Ca-C