SampleExam1(2)

SampleExam1(2) - Name_ BC 367, Exam 1 October 9, 2008...

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Name_____________________________________ BC 367, Exam 1 October 9, 2008 Multiple Choice (3 pts each)- Please circle the single best answer. 1. Given only the information shown here, which of the following statements is true? i) ethyl acetate + H 2 O ethanol + acetic acid Δ G ° = -19.7 kJ/mol ii) glucose + P i glucose-6-phosphate + H 2 O Δ G ° = 13.8 kJ/mol a) Reaction i) is faster than reaction ii). b) Reaction ii) is faster than reaction i). c) Neither reaction is spontaneous. d) At equilibrium, reaction i) will have more products than reaction ii). e) At equilibrium, reaction ii) will have more products than reaction i). 2. Uncontrolled diabetes can lead to acidosis. Which component of the blood buffering system could be administered as treatment for acidosis? a) HCO 3 - b) CO 2 c) H 2 CO 3 d) OH - e) Tris buffer 3. Sequencing of a novel peptide reveals the following: Ala-Cys a -Gly-Phe-Ser-Cys b -Met-Thr-Cys c -Gln The peptide contains one disulfide bond and one free Cys residue. Treatment of the intact peptide (containing its disulfide bond) by either cyanogen bromide or chymotrypsin does not break the peptide into two fragments. Where is the disulfide linkage? a) between Cys a and Cys b b) between Cys a and Cys c c) between Cys b and Cys c d) Between Cys a and Met e) It is impossible to tell from this information
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2 4. Which of the following is true with respect to the amino acid composition of proteins? a) Homologous proteins have the same amino acid composition. b) All proteins contain at least one each of the twenty different standard amino acids. c) Larger proteins have a more uniform distribution of amino acids than smaller proteins. d) Fibrous proteins often differ significantly in their amino acid compositions from globular proteins. e) The average molecular weight of an amino acid in a protein increases with the size of the protein. 5. Which of the following is false regarding the peptide bond? a) Peptide bonds in proteins are always in the trans configuration. b) Its components have excellent hydrogen bond forming capacity. c) It is essentially planar with no free rotation about the C-N axis. d) Its free energy of formation is thermodynamically unfavorable. e) Peptidyl prolyl isomerases catalyze isomerization of X-Pro peptide bonds, thereby
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This note was uploaded on 02/09/2010 for the course CH CH242 taught by Professor Katz during the Spring '10 term at Colby.

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SampleExam1(2) - Name_ BC 367, Exam 1 October 9, 2008...

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