is not a noncovalent interaction that stabilizes protein structure B) disulfide

Question

is not a noncovalent interaction that stabilizes protein structure B) disulfide bridges A) salt bridges D) the hydrophobic effect E) hydrogen bonding F All are. C) electrostatic interactions with metal ions 32. Characteristics of unsaturated fatty acids include A) found in plants but rarely in animals B) usually contain a double bond with trans stereochemistry C) always contain multiple double bonds D) can be converted to fats with lower melting temperature by hydrogenation E) None of these 33. Protein diseases can be caused by which of the following A) Activity of molecular chaperones. B) Formation of ion pairs during folding C) Mutations affecting the tertiary structure. D) All of the above are potential causes. E) None of the above are potential causes. 34. Protein dynamics is a field of study that examines the movements with in a protein. Which experimental method would be most useful to study this type of change? A) Electrospray Ionization mass spectrometry C) X-ray crystallography E) None of the above B) X-ray absorption spectroscopy D) Nuclear Magnetic Resonance 35. Which of the following is accomplished by molecular chaperones? A) They bind to misfolded proteins in order to protect against heat denaturation B) They facilitate aggregation of multiple subunits of a protein during synthesis C) They ensure that hydrophobic segments do not aggregate improperly D) They expose hydrophobic segments during protein synthesis, facilitating native folding E) None of the above are accomplished by molecular chaperones. comprises bacterial cell walls. A) proteoglycans B) chondroitin sulfate chains C peptidoglycans D) heparin E) pectin 1. Which of the following statements is true? A) Fatty acids with more than 18 carbons are the most common. B) Synthesis of fatty acids occurs in 2 carbon units. C) Fatty acids with conjugated double bonds very common in plants. D) In higher plants and animals, C12 and C14 species predominate 37. The H group of-_ commonly attaches O-linked oligosaccharides. A) aspartic acid B) glycine C)lysine D) threonine E) tyrosine 38. Even though peptide groups assume the trans conformation most of the time, 10% of the time, peptide bonds involvingassume the cis conformation because of altered steric hindrance A) Proline B) Glycine C) Alanine D) Tryptophan E) None of the above 39. We use triglycerides for long-term storage of energy, rather than sugars, because triglycerides: A) Are more water soluble. B) More oxidized. D) Serve also as materials for membranes. C) Contain stronger covalent bonds. E) None of these 40. Topology diagrams of proteins illustrate A) The path taken by a protein through a cel B)The relative height of the protein surface C) The symmetry of subunits D) The connectivity of secondary structure elements

Explanation / Answer

1) Disulfide bridges - Disulfide bonds are covalent bonds that help in protein folding. All other interactions mentioned such as salt bridges, electrostatic interactions, hydrophobic effect and hydrogen bonding are non-covalent interactions.

2) None of these - Fishes have a high unsaturated fatty acid content in their body, whereas other animals have both saturated and unsaturated fats. Unsaturated fats have atleast one single double bond, but with trans stereochemistry (trans fats) rarely occur in nature. Hydrogenation increases the melting temperature of fats.

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