BIBC102 Fall 2008 Midterm 2 key

BIBC102 Fall 2008 Midterm 2 key - Exam 2 Key Multiple...

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Exam 2 Key Multiple Choice Set A: Exam A Question Exam B Question Answer 2 7 C 3 8 B 4 9 D 5 10 A 6 11 B 7 12 B 8 13 D 9 14 A 10 15 C 11 16 B 12 17 D 13 18 A 14 19 B 15 20 C 16 21 D 17 22 A 18 23 D Short Answer: Exam A Question Exam B Question Answer 20 2 Mg 2+ ion, or electron resonance 21 3 Oxidase 22 4 6 CO 2 23 5 lactate 24 6 CO 2 True/False: Exam A Question Exam B Question Answer 25 24 F 26 25 T 27 26 T 28 27 F 29 28 F Multiple Choice Set B: Exam A Question Exam B Question Answer 30 30 D 31 31 D 32 32 F 33 33 B
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Exam A question 1, Exam B question 29: P O O - O - + P O O - O - P O O - O - + ADP P O O - O - ATP phosphoglycerate kinase Oxidized—Energy release drives addition of phosphate [5 pts.] High-energy acyl- phosphate bond—energy release from breaking this bond powers addition of phosphate to ADP [5 pts.] [7 pts] [7 pts] [7 pts] [5 pts.] [5 pts.] [3 pts.] [3 pts.] [3 pts.] [3 pts.] [minus 1 pt. for each incomplete phosphate] [2.5 pts.] [2.5 pts.]
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Choose one of the four protein complexes of the electron transport chain, and answer the questions given below for that complex. (3 pts.) Complex: 1 (6 pts.) What coenzyme or molecule transfers electrons into this complex? NADH (8 pts.) Write the balanced ½ reaction for the oxidation of that coenzyme or molecule as it transfers electrons into the complex. NADH + H + NAD + + 2e - + 2H + (6 pts.) What coenzyme or molecule receives the electrons as they leave this complex? ( I.e. , what is the next part of the electron transport chain down stream from the complex you have chosen?) Ubiquinone (Coenzyme Q) (Q) (8 pts.) Write the balanced ½ reaction for the reduction of this coenzyme or molecule as it receives electrons from the complex. Ubiquinone + 2H + + 2e - Ubiquinone (Ubiquinol) (12 pts.) If you consider the complex as an enzyme acting to transfer electrons from the donor and recipient molecules listed above, calculate the standard free-energy change ( Gº’) for this redox reaction.
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BIBC102 Fall 2008 Midterm 2 key - Exam 2 Key Multiple...

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