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• 20. Which compound serves as the methy! group donor for biological methylation reactions?(A) Methyl
• 21. Allopurinol is a drug used to treated chronic gout(痛風) because it inhibits_______.(A) ureate oxi
• 22. Carbamoyl phosphate synthetase I deficiency is an autosomal recessive metabolic disorder that ca
• 23. 5-Fluorouracil (5-FU) is used to treat cancers. It is a mechanism-based inhibitor of _________.(
• 24. Fatty-acid biosynthesis is vital in all biology. Which statement is correct?(A) The formation of
• 25. What effect would ketone bodies have on blood pH?(A) Neutralize pH (B) Lower pH(D) Fluctuate pH
• 26. The following figure shows the phi and psi angles of the residue X in a protein.(A) Phi angle is
• 27. There are three proteins X, Y, and Z in 20 mM Tris (pH 7.0) solution. 1. Protein X is a homohept
• 28. There are four peptides. Their sequences are: Peptide A : STRIKE Peptide B : ALLRIGHT Peptide C:
• 29. Because the enzymatic reaction rate is determined by the difference in energy between ES and____
• 30. In the enzyme catalyzed reaction sequence below, can the E- POA intermediate be predicted and wh
• 31. Which of the following statement regarding enzyme regulation is true?(A) Addition of an inhibito
• 32. When a mixture of glucose 6-phosphate and fructose 6-phosphate is incubated with the enzyme phos
• 33. Which of the following statement regarding citric acid cycle is false?(A) Citric acid cycle is a
• 34. Which of the following four statements regarding glycolysis and gluconeogenesis is correct?  1.
• 35. Which of the following statements regarding the enzymes involving in citric acid cycle is false?
• 36. Which statement about ATP synthesis in mitochondria is false?(A) To form proton gradient for ATP
• 37. Seven of the ten reactions of glycolysis are reversible (△G near zero) and can be used in revers
• 38. Addition of water across a double bond, or removal of water to form a double bond, is catalyzed
• 39. If levels of___________ and/or_____________are low， pyruvate is directed primarily  into _______
• 40. The 6-phosphogluconate dehy drogenase reaction in the pentose phosphate pathway is an example of
• 41. When a cell with the pentose phosphate pathway has need for more pentose phosphates, but not for
• 42.In the Southern hybridization procedure, the gel after electrophoresis is treated with NaOH andbe
• 43. A characteristic of the glycerophosphate shuttle is:(A) It shuttles NADH across the mitochondria
• 44. Oxaloacetate uniformly labeled with14C (ie., with equal amounts of14C in cach of its carbon atom