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Exam01_SP08 - EXAM#1(100 points BC 351 Spring 2008 Some...

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EXAM #1 (100 points) BC 351 Spring 2008 Some Potentially Useful Information: Amino Acid pK 1 α -COOH pK 2 α -amino pK R side chain gly 2.34 9.60 -- ser 2.21 9.15 13.6 glu 2.19 9.67 4.25 asp 1.88 9.60 3.65 lys 2.18 8.95 10.53 arg 2.17 9.04 12.48 his 1.82 9.17 6.00 val 2.32 9.62 -- pro 1.99 10.96 -- ∆G=∆H-T∆S ΔG΄˚ = -RTlnK eq Answer Sheet instructions: Fill out your name and your Student ID# which is NOT your SSN. Hand the bubble sheet in at a stack that I designated up front. The test and the short answer section must be handed in separately and I have given instructions for this on the short answer sheet. Matching Instructions -Fill in the correct bubble for the BEST answer to each of the following: There is only one correct answer per question. Each question is worth 4.0 points. Set One (Question # 1-5 on your answer sheet) 1. _ _ pK a A. Allows you to predict the affinity of a molecule for a proton. 2. __ Equilibrium B. A non-covalent interaction between one electronegative atom and a hydrogen atom bound to a separate electronegative atom. 3. __ Bond Dissociation energy C. If small and positive, represents a weak bond. 4. __ Enthalpy D. The rate of the forward reaction matches the rate of the reverse reaction. 5. __ H-bond E. Reflection of the number and types of bonds.
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Set Two (Question # 6-10 on your answer sheet) 6. __ Subunit A. Forms a covalent bond with the Fe in the heme group. 7. __ K d B. Ratio of the binding sites on a protein that are occupied and the total number of binding sites. 8. __ Fraction bound C. Ligand concentration where ½ the binding sites are occupied. 9. __ Distal His D. Sterically hinders carbon monoxide binding in myoglobin. 10. __ Proximal His E. An individual polypeptide with its own N and C- terminus that comes together with other polypeptides to form a protein exhibiting quaternary structure. Multiple choice Instructions -Fill in the correct bubble for the BEST answer to each of the following: There is only one correct answer per question. Each question is worth 4 points. 11. The reaction below depicts an attempt to dissolve oil into water (where Oil (aq) represents dissolved oil). For the reaction to proceed in the direction it is written: Oil(l) ↔ Oil (aq) A) the change in enthalpy will be negative. B) the change in entropy will be negative. C) the change in gibbs free energy will be negative. D) the change in entropy will be positive. E) there is no way to determine what the sign will be on any of the thermodynamic terms.
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