81. Which of the following has the lowest protein content (as a percentage of dry weight)?
(A) Chylomicron
(B) VLDL
(C) IDL
(D) LDL
(E) HDL

82. The following are intermediate products in cholesterol synthesis. Please select the correct order of the synthesis pathway. ① Acetyl-CoA ② Activated isoprene ③ Cholesterol ④ Lanosterol ⑤ Mevalonate ⑥ Squalene (A) ①→⑤→②→④→⑥→③ (B) ①→②→⑤→⑥→④→③ (C) ①→⑤→⑥→②→④→③ (D) ①→⑤→②→⑥→④→③ (E) ⑤→①→②→⑥→③→④

83. Which of the following statements correctly describes how miRNA degrades target mRNA? (A) After mature miRNA binds to RISC, it suppresses translation when partially complementary to the mRNA. (B) miRNA directly binds to the mRNA poly-A tail to promote its degradation. (C) miRNA functions in the nucleus and promotes mRNA degradation by altering DNA methylation. (D) miRNA inhibits mRNA transcription by interfering with RNA polymerase II, ultimately leading to mRNA degradation. (E) Dicer cleaves pri-miRNA in the nucleus, while Drosha processes pre-miRNA in the cytoplasm.

84.   ①   is one of the enzymes that appears in   ②  . Which one of the following is NOT correct? (A) ① Arginase; ② urea cycle (B) ① Pyruvate dehydrogenase; ② TCA cycle (C) ① Aspartate transcarbamoylase; ② the de novo biosynthesis of pyrimidine (D) ① Glucose-6-phosphate dehydrogenase; ② the pentose phosphate pathway (E) ① Ribonucleotide reductase; ② the de novo biosynthesis of dNTP

85. Which of the following statements about amylose and cellulose is correct? ① The sugar residue in amylose and cellulose is glucose. ② Amylose is the storage polysaccharide, and cellulose is the structural polysaccharide. ③ Amylose has a regular helical conformation. ④ Sugar residues in cellulose are connected by α(1→4) linkage.  ⑤ Sugar residues in amylose are connected by β(1→4) linkage. (A) ①②③ (B) ①③④ (C) ①④⑤ (D) ②③④ (E) ②④⑤

86. Which of the following enzymes CANNOT reduce ubiquinone (Q) to ubiquinol (QH₂) in the mitochondrial electron transport chain? (A) Dihydroorotate dehydrogenase (B) Succinate dehydrogenase (C) ETF: ubiquinone oxidoreductase (D) ATP synthase (E) Glycerol 3-phosphate dehydrogenase

87. Which of the following statements about the pentose phosphate pathway is correct? ① The pentose phosphate pathway produces NADPH and ribose-5-phosphate. ② The pentose phosphate pathway begins with the oxidation of glucose-1-phosphate.  ③ The pentose phosphate pathway consists of oxidative and non-oxidative reactions. ④ The pentose phosphate pathway is also known as hexose monophosphate shunt. ⑤ The oxidative phase of the pentose phosphate produces one molecule of NADPH. (A) ①②③ (B) ①③④ (C) ①③⑤ (D) ①④⑤ (E) ①②④

88. Which of the following statements about glycogenolysis is correct? ① Epinepherine promotes glycogenolysis in muscle. ② Glucagon promotes glycogenolysis in liver. ③ Insulin promotes glycogenolysis in liver. ④ Phosphorylase b catalyzes the breakdown of glycogen into glucose. ⑤ Phosphorylase a catalyzes the breakdown of glycogen into glucose-1-phosphate. (A) ①②③ (B) ①②④ (C) ①②⑤ (D) ②③④ (E) ②④⑤

89. Which of the following statements is NOT correct regarding the interaction of carbon monoxide (CO) with hemoglobin (Hb)? (A) A Hb with two bound CO molecules releases little oxygen in the tissues. (B) Fetal Hb has a higher affinity for CO than adult Hb. (C) Removing CO-poisoned person from CO-polluted site results in slowly dropping of COHb level. (D) As CO bind to two Hb subunits, the affinity for oxygen is decreased in the remaining substrates. (E) The CO-oxygen exchange can be accelerated by 100% oxygen at a pressure of 3 atm.

90. Which of the following statements is correct regarding reversible inhibition of enzymes? ① The catalytic efficiency of enzyme is  in the presence of competitive inhibitors. ② Competitive inhibitors are substrate analogs or transtion state analogs. ③ Uncompetitive inhibitors combine only with enzyme-substrate complex. ④ In the presence of inhibitors, the initial rate of enzyme-catalyzed reactions is positively correlated with substrate concentration. ⑤ The binding of noncompetitive inhibitors to enzymes is inhibited by substrate. (A) ①②③ (B) ②③④ (C) ③④⑤ (D) ①③④ (E) ②④⑤

1. 指令暫存器(IR)是在哪一單元內？ (A)記憶單元 (B)控制單元 (C)邏輯單元 (D)算術運算單元。

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