Fina Examination 16) For proteins to fold correctly, there can be free rotation

Question

Fina Examination 16) For proteins to fold correctly, there can be free rotation around theand bonds of the peptide chain. a) Phi c) Omega d) A and B e) Aand C 17) If you identified a protein secondary structure separated by a short 4 amino acid sequence containing a proline you might have an a) Antiparallel B-sheet b) Random co c) Parallel ?-sheet d) ?-helix e) Not enough information to determine the structure 18) An example of protein quaternary structure would be a) The amino acid sequence b) ?-helices c) A helix-turn-helix motif d) The 3-dimensional folded protien e) A homo-dimer of peptides 19) Which statement is not part of the description of the fluid mosaic model of membrane structure? a) Membranes are bilaminar and composed primarily of phospholipids b) Lipids can freely diffuse from one leaflet to the other leaflet c) Embedded proteins and lipids and can diffuse freely within the plane of the membrane d) Membranes exist in a viscous fluid state e) Proteins can be peripherally associated or embedded into membranes 20) Prostaglandin synthesis, and inflammation, can be inhibited by the action of the nonsteroidal anti-inflammatory drugs, aspirin and ibuprofen, competing with binding of to cyclooxygenases a) Thombroxanes b) Histamine c) Linolineic acid d) Sterols e) Arachidonic acid

Explanation / Answer

16.Protein folding is a spontaneous process. However, there are forces to control the process and to predict its fold. Essentially, these are two forces Phi and Psi.

Hence, (d) is the correct answer.

17. (D) Apha helix

18. A homo-dimer of peptides is an example of protein quaternary structure.

19. (C) is not the correct statement as per fluid mosaic model of cell membrane.

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