20. Which of the following statements correctly describes the role of hormones in the coordinated regulation of glycolysis and gluconeogenesis in liver?
(A) Glucagon stimulates glycolysis and inhibits gluconeogenesis.
(B) Insulin stimulates gluconeogenesis and inhibits glycolysis.
(C) Glucagon decreases the levels of fructose-2,6-bisphosphate and inhibits glycolysis.
(D) Insulin increases the levels of fructose-2,6-bisphosphate and inhibits glycolysis.
(E) Epinephrine inhibits both glycolysis and gluconeogenesis.

21. Which of the following substances is necessary for the synthesis of palmitate? ① FADH2 ② Malonyl-CoA ③ NADPH ④ NADH ⑤ Acetyl-CoA (A) ①②③ (B) ①②④ (C) ①④⑤ (D) ②③⑤ (E) ①②⑤

22. Which of the following enzyme-catalyzed steps in glycolysis is performed by different enzymes in gluconeogenesis?  ① Hexokinase ② Pyruvate kinase ③ Aldolase ④ Phosphofructokinase ⑤ Phosphoglycerate kinase (A) ①②③ (B) ②③④ (C) ①②④ (D) ②③⑤ (E) ①②⑤

23. Which of the following cofactors is essential for the activity of several key enzymes in glycolysis, primarily by forming a complex with ATP? (A) Zinc ion (B) Cobalamin (Vitamin ) (C) Thiamine pyrophosphate (TPP) (D) Pyridoxal phosphate (PLP) (E) Magnesium ion

24. Which protein complex in the mitochondrial electron transport chain has the largest molecular weight and is also inhibited by rotenone? (A) Complex I (NADH: ubiquinone oxidoreductase) (B) Complex II (Succinate dehydrogenase) (C) Complex III (Cytochrome bc₁ complex) (D) Complex IV (Cytochrome oxidase) (E) Complex V (ATP synthase)

25. Which molecule plays a key regulatory role in glycolysis, fat metabolism, and the pentose phosphate pathway (PPP)? (A) Fructose 6-bisphosphate (B) Xylulose 5-phosphate (C) Citrate (D) Phosphoenolpyruvate (PEP) (E) NADPH

26. RNA is more susceptible to hydrolytic cleavage than DNA due to structural differences. Which of the following best explains its increased instability? (A) RNA lacks complementary base pairing, reducing structural stability. (B) RNA contains uracil instead of thymine, making it more susceptible to degradation. (C) RNA lacks the double-helix structure of DNA, reducing protection from external damage. (D) RNA is more chemically reactive than DNA due to its ribose sugar. (E) The 2'-hydroxyl (-OH) group in RNA facilitates self-cleavage under alkaline conditions.

27. Which statement about histones is correct? ① Histones are negatively charged proteins that stabilize the DNA double helix. ② Lysine and arginine residues of histones can be methylated.  ③ Histone octamer contains H2A, H2B, H3, and H4. ④ Deacetylation of histones is not involved in epigenetic regulation. ⑤ H1 is involved in linking nucleosomes. (A) ①②③ (B) ①③④ (C) ②③④ (D) ②③⑤ (E) ③④⑤

28. What is the primary function of reverse transcriptases in retroviruses? (A) To synthesize RNA from a DNA template (B) To convert RNA genomes into double-stranded DNA (C) To degrade viral RNA (D) To synthesize telomere ends of chromosomes (E) To insert RNA introns into DNA genes

29. Which kinase in MAPK cascade is responsible for phosphorylating both Thr and Tyr residues on its substrate? (A) Raf-1 (B) ERK (C) MEK (D) IRS1 (E) Grb2

30. An enzymatic reaction has a maximum velocity of 30 µM/min and a Michaelis constant of 50 µM. If the substrate concentration ([S]) is 25 µM, what is the reaction velocity (v)? (A) 7.5 μM/min (B) 10 μM/min (C) 15 μM/min (D) 20 μM/min (E) 25 μM/min

115年 - 115 國立中山大學_學士後醫學系招生考試試題：普通生物及生化概論#138369

115年 - 115 學士後醫學系招生考試試題：普通生物及生化概論#138357

115年 - 115 國立清華大學_學士後醫學系單獨招生試題：生物與生化#138208

115年 - 115 國立中興大學_學士後醫學系公費生招生考試：普通生物及生化概論#138023

114年 - 114 學士後醫學系招生考試試題：普通生物及生化概論#126681

114年 - 114 國立中興大學_學士後醫學系公費招生考試：普通生物及生化概論#126435

114年 - 114 國立中山大學_學士後醫學系招生考試試題：普通生物及生化概論#126236

114年 - 114 國立清華大學_學士後醫學系考試︰生物生化#126232

113年 - 113 國立中興大學_學士後醫學系公費招生考試：普通生物及生化概論#119946

113年 - 113 國立清華大學_學士後醫學系招生考試_學士後醫學系：生物及生化#119851