PractExam1 - Biology 310 Introductory Biochemistry Example...

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Biology 310 Introductory Biochemistry Example Exam 1 Questions Note that these are example questions of the type you will see on your exam. The number of questions may vary from this problem set as well as the distribution of questions. _______________________________________________________________________________________________________ 1. Nearly all Amino Acids in eukaryotic proteins are which stereoisomer? a. L b. R c. S d. D e. G 2. Leptin is a signal that works in the brain in a catabolic capacity. Therefore, it promotes _____________ processes, and given the additional information that it affects adipose (fat) tissue, it most likely promotes ___________. a. free-energy-yielding (endergonic), fat break down b. in need of energy input (endergonic), amino acid accumulation c. in need of energy input (exergonic), fat mass degradation d. free energy-yielding (exergonic), carbohydrate breakdown e. free-energy yielding (exergonic), fat breakdown 3. Which of the following functional groups is not present in Acetyl coenzyme A (pictured)? A. Phosphoryl B. Carboxyl C. Amido D. Methyl E. Thioester 4. What is the pH of a solution containing 0.2 M Acetic acid (pKa = 4.7) and 0.1 M Sodium acetate? A. 0.67 B. 0.3 C. 5.0 D. 4.4 E. -0.3 1
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5. Amphipathic molecules have regions that are ____ and other regions that are ______. A. Positively charged, negatively charged. B. Saturated, unstaturated C. Acidic, alkakline D. Polar, nonpolar E. Folded, unfolded 6. Which of the following amino acids is Positively Charged, with respect to R-group? A. K B. T C. D D. A E. F 7. Which of the following statements is TRUE? A. The ion product of water is always pH = 7.0 (that is, 1x10 -7 M) B. Keq describes the ratio of product concentration(s) to reactant concentration(s). C. Hydronium ions are neutral molecules formed from water and protons D. The stronger the acid, the smaller the Ka (Dissociation Constant) E. The titration curve of a diprotic acid like Carbonic Acid would actually have 3 pKa values, but one is called the Isoelectric Point and it is the mean value of the other two. 8. Which separation method exploits differences in sign and magnitude of the net charge of a protein at a given pH? A. Size exclusion chromatography
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This note was uploaded on 01/06/2010 for the course MCDB 310 taught by Professor Walter during the Fall '09 term at University of Michigan.

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PractExam1 - Biology 310 Introductory Biochemistry Example...

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