複選題
43. Which molecule contains an phosphoanhydride bond?
(A) DNA
(B) AMP
(C) UDP
(D) RNA

42. Which molecule contains an phosphoanhydride bond? (A) DNA. (B) RNA. (C) UMP. (D) ADP. (E) cAMP.

44. All are properties of glycerol-3-phosphate dehydrogenases except: (A) one is located in the cytosol. (B) works to carry electrons into mitochondria. (C) one is located in the inner mitochondrial membrane. (D) mitochondrial enzyme has bound coenzyme Q. (E) FAD-dependent mnitochondrial enzyme.

45. Which of these staterents about the membrane proteins is true? (A) An integral membrane protein can be extracted with a chelating agent that removes divalent cations. (B) Peripheral membrane proteins are generally noncovalently bound to membrane lipids. (C) Carbohydrate moieties of membrane glycoproteins are linked to the intracellular domain of the proteins. (D) Peripheral membrane proteins may have functional units on both sides of the membrane. (E) Glycosylphosphatidylinositols, abbreviated GPI, are complex glycolipids that attach some proteins to the cytosolic surface of the plasma membrane. 

46. Besides B-oxidation for lipid ietabolism, there are other ways to catabolize lipid. Which statement is correct? (A) There is NAD-dependent β-oxidation for lipid metabolism in peroxisomes. (B) The B-oxidation in peroxisomes uses O2 to oxidize lipid and produces H2O2. (C) Branched-chain lipids are degraded via co-oxidation. (D) a-Oxidation is the main route to produce dicarboxylic acids. (E) None of the above.

47. Purine is a heterocyclic aromatic organic compound that consists of a pyrimidine ring fused to_________ ring. (A) benzene (B) ribose (C) imidazole (D) furan (E) pyrazole

48. Thymidylate synthase methylates dUMP at 5 position to make dTMP. The methyl donor is _________.(A) S-adenosylmethionine (B) methylene-THF (C) 5-methyl-THF (D) taurine (E) creatine.

49. Synthesis of triacylglycerol in adipocytes requires high level of glucose in the blood, because: (A) glycolysis of glucose provides high level of acetyl CoA for fatty acid synthesis. (B) glycolysis of glucose provides high level of ATP. (C) glycolysis of glucose provides dihydroxyacetone phosphate for glycerol phosphate synthesis. (D) glycolysis of glucose provides high level of NADH for fatty acid synthesis. (E) pentose phosphate pathway provides high level of NADPH for fatty acid synthesis.

50. Nitrifying bacteria obtain their chemical energy from: (A) the reduction of NO3 to . (B) the formation of  from N2 gas. (C) the oxidation of  to N2. (D) the oxidation of to  (E) the formation of NO2, from

6. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups? (A) 1,1-dimethylcyclohexane (B) cis-1,2-dimethylcyclohexane (C) trans-1,2-dimethylcyclohexane (D) trans-1,3-dimethylcyclohexane

1. Which description below about C3 and C4 plants are INCORRECT? (A) Among all plant families, the grass family has the highest number of species using the C4 photosynthetic pathway. (B) Photosynthesis in C3 plants lead to lowerfractionation compared to that in C4 plants. (C) C4 photosynthesis is evolutionarily younger than C3 photosynthesis. (D) C4 plants are in general more efficient in water usage than C3 plants.

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