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BS_111__Practice_exam_I_2011_Answers

BS_111__Practice_exam_I_2011_Answers - Practice Exam I...

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Practice Exam I Answers Choose the one best answer. 1. There are expected advantages of having compartments within the eukaryotic cell. Among these advantages are: A. Concentration of reactants to increase reaction rates. B. Having enzymes for a particular biochemical process in one site. C. Separating the reactions of anabolism from those of catabolism. D. A and B above. E. A, B and C above. 2. The molecular weight of glucose is 180. A diabetic high blood glucose level is 10 mM. In one liter of diabetic blood you would find this amount of dissolved glucose: A. 180 g. B. 18 g. C. 1.8 g. D. 180 mg. This would be the amount in 1 mM. You want ten times that. E. 18 mg. Use the following figure to identify the bonds of a protein. 3. A covalent bond which links two parts of the primary sequence is: E 4. Van der Waals forces are here: C 5. A hydrogen bond involving an amino functional group is: B 6. The step in the Central Dogma of Francis Crick in which DNA information moves to RNA information is called: 7. Bond strengths in hydrocarbon molecules are in this order from weakest to strongest.
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8. All cells use the left-handed enantiomers of amino acids in making polypeptides. This is because: 9. All cells use the left-handed enantiomers of amino acids in making polypeptides. This is because: a. the chemistry of the alpha carbon does not allow the formation of a right-handed enantiomer of amino acids. b. the enzymes used in biochemical reactions and ribosome used for making polypeptides have structures which allow only the left-handed version to bind to them. c. the left-handed enantiomers of amino acids have a greater amount of free energy in their chemical bonds. d. the right-handed amino acids are less soluble in water. e. the left-handed amino acids do not increase the pH of water but the right-handed amino acids do increase the pH of water in which they are dissolved.
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