73. The thickness of endoplasmic reticulum membrane is about 37.5 Å. Which one of the followings is closest to this length?
(A) alpha-helix with 10 amino acid residues long
(B) alpha-helix with 40 amino acid residues long
(C) alpha-helix with 80 amino acid residues long
(D) B-DNA with 10 base pairs long
(E) B-DNA with 40 base pairs long

69. How many of the followings are ketogenic amino acid in human? Asp； Phe； Arg； Val； His； Thr； Lys. (A) 2 (B) 3 (C) 4 (D) 5 (E) 6

70. How many items of the followings have the activity of proof-reading to reduce the error rate in biosynthesis?DNA polymerase； RNA polymerase II； amino-acyl tRNA synthetase； Initiation Factor-1； polyketide synthase； Elongation Factor-Tu； Klenow fragment. (A) 2 (B) 3 (C) 4 (D) 5 (E) 6

【已刪除】71. Which one of followings is NOT used for thymine dimer repair? (A) Daughter strand gap repair (B) Base excision repair (C) Nucleotide excision repair (D) Photolyase (E) DNA polymerase Eta (Pol )

72. The pentose phosphate pathway of glucose oxidation produces ______. (A) coenzyme Q10 (B) FADH2 (C) glucose-1-phosphate (D) NADH (E) ribose-5-phosphate

74. There are cholesterols and cholesterol esters in LDL. How and where are cholesterol esters generated in a human body? (A) Cholesterol esters are generated by lecithin: cholesterol acyltransferase in endothelial cells. (B) Cholesterol esters are produced by lecithin: cholesterol acyltransferase in macrophages. (C) Cholesterol esters come from the reaction between free short-chain fatty acids and cholesterols. (D) Cholesterol esters are generated from the reaction between free long-chain fatty acids and cholesterols. (E) Cholesterol esters are produced by lecithin: cholesterol acyltransferase in the bloodstream.

75. Okazaki fragments are ______. (A) short DNA pieces that explain how DNA is synthesized on the lagging strand (B) short DNA pieces that explain how DNA is synthesized on the leading strand (C) the remnants of the original strands that are dispersed in the new double stranded DNA molecules (D) RNA primers used for DNA replication (E) Fragments of mRNA that are processed into mature mRNA molecules

76. Which of the followings describes the initial bond formation in the covalent intermediate in the reaction catalyzed by chymotrypsin? (A) Serine 195 and the carbonyl carbon in the peptide backbone (B) Serine 195 and the nitrogen in the peptide backbone (C) Histidine 57 and the carbonyl carbon in the peptide backbone (D) Histidine 57 and the nitrogen in the peptide backbone (E) Aspartate 102 and the carbonyl carbon in the peptide backbone

77. Which of the following statements about farnesyl-linked proteins and glycosylphosphatidylinositol (GPI)-linked proteins is TRUE? (A) Farnesyl-linked proteins and GPI-linked proteins are randomly distributed in the plasma membrane. (B) Farnesyl-linked proteins and GPI-linked proteins are frequently associated with the outer leaflet of the plasma membrane. (C) Farnesyl-linked proteins and GPI-linked proteins are frequently associated with the inner leaflet of the plasma membrane. (D) Farnesyl-linked proteins are associated with the outer leaflet of the plasma membrane, and GPI-linked proteins are frequently associated with the inner leaflet of the plasma membrane. (E) Farnesyl-linked proteins are associated with the inner leaflet of the plasma membrane, and GPI-linked proteins are frequently associated with the outer leaflet of the plasma membrane.

78. What is an important component(s) to transport ammonia from skeletal muscles and the other tissues to the liver? (A) Albumins (B) Alanine from skeletal muscles and glutamine from most tissues (C) Glutamates (D) Alanine from skeletal muscles and glutamate from most tissues (E) Glycine from skeletal muscles and glutamate from most tissues

79. Which statement about energy metabolism in patients with type I diabetes mellitus and poor blood glucose control is NOT true? (A) Ketone bodies are mainly derived from the metabolism of glucose-produced acetyl-CoA. (B) Ketone bodies can replace glucose as a cellular energy source. (C) Intermediate products of the Krebs cycle, such as oxaloacetate, are used in gluconeogenesis, leading to an increase in blood glucose. (D) Due to the lack of oxaloacetate, acetyl-CoA cannot enter the Krebs cycle, resulting in its conversion into ketone bodies. (E) Fatty acids are converted into ketone bodies as an alternative energy source in the absence of glucose.