exam1b - BIOL/CHEM 3361 Spring 2011 Name_ EXAM I FORM B...

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BIOL/CHEM 3361 Name__________________________ Spring 2011 EXAM I FORM B Place your name at the top of this page of the exam. On the F-1712 Scantron form, use a no. 2 pencil to enter your test form designation, i.e., A or B. Also print and encode your name and your UTD ID (starting in the first column on the left and leaving the last spaces blank). Leave phone number, code and subject score sections blank. Select the best answer for the following multiple-choice questions and enter the corresponding letter on the Scantron sheet. You may use these test pages to make notes and work problems. You may use a non-graphing calculator or a graphing calculator you have cleared of all stored data. When finished, turn in this exam along with your Scantron sheet. 1. What is the ratio of the concentration of a weak acid to its conjugate base when the pH of a solution is equal to the pKa of the weak acid? a. 1:2 b. 1:10 c. 10:1 d. 2:1 e. 1:1 2. Which of the following amino acids has a side chain that can form hydrogen bonds? a. serine b. glycine c. isoleucine d. valine e. alanine 3. An amino acid with N in its side chain is a. Arg b. Trp c. Asp d. a & b e. all of the above 4. In mass spectrometry proteins are separated in the basis of their a. size b. charge at pH 2 c. m/z ratio d. pI e. polarity
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5. The Δ Gº´ for the reaction below is -24 kJ/mol at 25º C. What is the Gibbs free energy change for the reaction if all species are 0.01 M in concentration? R is 8.31 J/ºK mol A B + C a. -20 kJ/mol b. -23 kJ/mol c. -30 kJ/mol d. -35 kJ/mol e. -40 kJ/mol 6. Which of the following amino acids has a side chain that can participate in charge-charge interactions? a. S b. N c. I d. H e. A 7. When non-polar molecules are dissolved in water, which of the following is true? a. The normal clathrate structure of water is broken up b. Charge-dipole interactions hold the molecules in solution c. The entropy of the system increases d. H-bonds form between the non-polar molecules and water e. H 2 O forms a clathrate-like structure around the non-polar molecules 8. Which of the following will contribute to a reaction going in the forward direction? a.
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This note was uploaded on 02/08/2012 for the course CHEM 3361 taught by Professor Marsh during the Spring '11 term at University of Texas at Dallas, Richardson.

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exam1b - BIOL/CHEM 3361 Spring 2011 Name_ EXAM I FORM B...

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