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Unformatted text preview: 114A FinalPracticeProblem: 2007 1. In a conjugated protein, a prosthetic group is: A) a part of the protein that is not composed of amino acids. B) a fibrous region of a globular protein. C) a subunit of an oligomeric protein. D) synonymous with "protomer." E) a nonidentical subunit of a protein with many identical subunits. 2. The functional differences, as well as differences in three-dimensional structure, between two different enzymes from E. coli result directly from their different: A) roles in DNA metabolism. B) amino acid sequences. C) secondary structures. D) roles in the metabolism of E. coli. 3. Even when a gene is available and its sequence of nucleotides is known, chemical studies of the protein are still required to determine: A) the location of disulfide bonds. B) the number of amino acids in the protein. C) the amino-terminal amino acid. D) molecular weight of the protein. E) whether the protein has the amino acid methionine in its sequence. 4. Why is ethanol used to treat poisoning by methanol or ethylene glycol? 5. Why do the furanose and pyranose forms of monosaccharides predominate in nature? 6. How can an enzyme produce a chiral product from a nonchiral or prochiral substrate? 7. Give an explanation for the inability of a zymogen to catalyze a reaction. 8. Which of the following statements about sterols is true? A) Sterols are found in the membranes of all living cells. B) The principal sterol of animal cells is ergosterol. C) All sterols share a fused-ring structure with four rings. D) Sterols are very soluble in water, but less so in organic solvents such as chloroform. 9. Which of the following is true of sphingolipids? A) Phosphatidylcholine is a typical sphingolipid. B) They always contain glycerol and fatty acids. C) They may be charged, but are never amphipathic. D) Cerebrosides and gangliosides are sphingolipids. 10. In an aqueous solution, protein conformation is determined by two major factors. One is the formation of the maximum number of hydrogen bonds. The other is the: A) formation of the maximum number of hydrophilic interactions. B) maximization of ionic interactions. C) minimization of entropy by the formation of a water solvent shell around the protein. D) placement of polar amino acid residues around the exterior of the protein. E) placement of hydrophobic amino acid residues within the interior of the protein. 11. Which of the following best represents the backbone arrangement of two peptide bonds? A) C -N-C -C-C -N-C -C B) C -N-C-C-N-C C) C-N-C -C -C-N D) C -C-N-C -C-N E) C -C -C-N-C -C -C 12. Which of the following groups correctly shows intrachain hydrogen bonding ||| in an a helix?...
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This note was uploaded on 10/28/2010 for the course CHEM 114A taught by Professor Viadhiu during the Fall '08 term at UCSD.
- Fall '08