BMB258 S06 pT1 KEY

BMB258 S06 pT1 KEY - BMB 258 SPRING 2006 ANSWERS TO THE...

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BMB 258 SPRING 2006 ANSWERS TO THE PRACTICE EXAMINATION Multiple Choice Answers 1. A 2. D 3. D 4. E 5. E 6. E 7. B 8. B 9. B 10. D 11. A 12. D 13. C 14. B 15. D 16. B 17. E 18. B 19. D 20. A 21. A 22. A 23. B 24. A 25. A 26. A 27. B 28. B 29. D 30. B 31. D 32. E 33. C 1
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34. What metabolic role is served by protein phosphorylation and dephosphorylation? ANS: Protein phosphorylation and dephosphorylation are used to regulate enzyme activity, any one enzyme being active in one state (phosphorylated or dephosphorylated) and inactive in the other. It is a mechanism whereby hormones regulate enzyme activity. In the case of allosteric enzymes, phosphorylation/dephosphorylation markedly affects the enzyme’s response to effectors . 35. Write two reactions that together constitute a futile cycle. ANS: Glucose + ATP → Glucose 6P + ADP (1) Glucose 6P + H 2 O → Glucose + Pi (2) SUM: ATP + H 2 O → ADP + Pi (1) The enzyme is glucokinase or hexokinase (2) The enzyme is glucose 6-phosphatase 36. Define cofactor ANS: Cofactors are ions and coenzymes that act respectively as activators and cosubstrates for enzymes. They may be loosely or tightly bound to the enzyme . 2
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This document was uploaded on 11/04/2011 for the course BMB 258 at University of Miami.

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BMB258 S06 pT1 KEY - BMB 258 SPRING 2006 ANSWERS TO THE...

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