Spring 10 - Name: _ CHEM 340.01: Biochemistry I E xam 1 F...

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Name: ______________________________________________________________________________ 1 CHEM 340.01: Biochemistry I Exam 1 February 17, 2010 Part I: Eeny, meeny, miney moe…. For questions 1-20, choose the single best answer. Please mark your answer on the Scantron card AND on the exam. Thank you. (2 pts. each) 1) One of the properties or features of water that make is such a unique substance is its: a) molecular weight. b) chemical composition. c) availability. d) electronic geometry. 2) Biological molecules such as proteins and DNA have the 3D structures that they do due to: a) how they interact with water. b) their chemical compositions. c) their limited lifetimes. d) their being made mostly of carbon. 3) The formation of a single hydrogen formation involves ___ atoms. a) 1 b) 2 c) 3 d) 4 4) The ionization constant of water is: a) 1 x 10 -14 b) 1 x 10 -16 c) 1 x 10 -7 d) 1 x 10 7 5) Water has a very high dielectric constant. What is the significance of this property with respect to keeping a cell alive? a) The high dielectric constant helps prevent the collection of ionic species in the cell from aggregating. b) The high dielectric constant helps keep the non-polar species in the cell together. c) The high dielectric constant allows for high concentrations of ionic species without precipitation. d) all of the above. 6) The strongest hydrogen bonds (H-bonds) are formed when the: a) atoms involed are in a straight line. b) hydrogen is attached to an oxygen. c) hydrogen is attached to a nitrogen. d) atoms involved are not all in a straight line.
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Name: ______________________________________________________________________________ 2 7) You have two solutions. One is a 10 mM acetic acid solution and one is a 10 mM NaH 2 PO 4 solution. Both solutions are at pH 5. Which of the statements below is TRUE? (see the Supplementary Information sheet for help) a) The acetic acid solution is primarily (>50%) in the conjugate base form. b) The NaH 2 PO 4 solution, is primarily (>50%) in the conjugate base form. c) Both solutions have equal amounts of conjugate base present. d) The NaH 2 PO 4 solution does not have a conjuagate base or acid because it’s a salt solution. 8) The pK a of acetic acid is 4.76. If 10 ml of 0.1M acetic acid was mixed with 10 ml of 0.1M sodium acetate and the solution was brought to a final volume of 30ml, what would be the pH of the final solution? a)
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Spring 10 - Name: _ CHEM 340.01: Biochemistry I E xam 1 F...

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