x2-spr09-key - succinyl CoA 28. a) +0.123 V b) -23.74...

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MCB 450 Spring 2009 Examination 2 – Answer Key 1. A 2. D 3. B 4. A 5. E 6. E 7. D 8. Omit 9. Omit 10. D 11. D 12. A 13. B 14. E 15. C 16. A 17. A 18. C 19. (1) Phosphorylated compounds are membrane-impermeable, thus confining the intermediates of glycolysis to the cytosol. (2) All the phosphates wind up being transferred to ADP to make ATP. 20. The iron of cytochrome c is alternately present as Fe 3+ and Fe 2+ , depending on whether the cytochrome is oxidized or reduced. The iron of myoglobin must always be present in the Fe 2+ state if it is to reversibly combine with oxygen. 21. It will wind up in the methyl carbon of pyruvate. 22. Galactose + 2ADP + 2Pi = 2 lactic acid + 2ATP + 2 H 2 O. 23. a) 2 b) 2 c) 1 d) 2 24. 1) A + E = ER + P 2) ER + B = Q + E ER is a modified form of the enzyme covalently attached to a remaining piece of substrate A. The reaction has a double-displacement or ping-pong mechanism. 25. glyceraldehyde 3-phosphate 26. acetyl CoA 27.
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Unformatted text preview: succinyl CoA 28. a) +0.123 V b) -23.74 kJ/mole 29. a) Tissues generate carbon dioxide, which combines with water to make H 2 CO 3 . The H 2 CO 3 in turn dissociates to give H + + HCO 3-. The H + generated in the formation of bicarbonate then combines with HbO 2 to give HHb + O 2 . The foregoing equilibria, which constitute the Bohr effect, explains how carbon dioxide is transported as biocarbonate from the tissues to the lungs. In the lungs these processes reverse, and carbon dioxide is once again formed. The major carbon dioxide-producing reactions are the pyruvate dehydrogenase reaction, and the two decarboxylation steps of the TCA cycle, that involving isocitrate dehydrogenase, and that involving a-ketoglutarate dehydrogenase. 30. See the answer key for examination 2 in the spring of 2007. It is on the course website....
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This note was uploaded on 09/14/2009 for the course MCB 450 taught by Professor Mintel during the Summer '07 term at University of Illinois at Urbana–Champaign.

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x2-spr09-key - succinyl CoA 28. a) +0.123 V b) -23.74...

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