90. Which of the following statement regarding electron transport and ATP synthesis is not true?

(1) The synthesis of ATP is directly linked to the oxidation ofNADH.

(2) The synthesis of ATP in mitochondria is driven by a proton or pH gradient.

(3)The reoxidation ofNADH and FADH₂ indirectly creates a proton gradient that is involved in ATP synthesis.
(A) (1)only
(B) (2) only
(C) (3)only
(D) All are correct
(E) None is correct.

22. There is no codon for the amino acid hydroxyproline, but this amino acid is a prominent feature ol collagen structure. Which of the following is a likely explanation? (A) Hydroxyproline is substituted for proline after translation by a cut and patch mechanism. (B) Proline is covalently modified to give hydroxyproline after translation. (C) There is an alternative mechanism for synthesis of proteins that contain hydroxyproline. (D) All of the above are likely explanations. (E) It is not possible to fbnn a hypothesis from tiie information given.

23. Which metabolite levels determine whether acetyl-CoA derived from fetty acids can enter the citric acid cycle? (A) Citrate (B) Succinyl CoA (C) Oxaloacetate (D) a-Ketoglutarate (E) None of the above

24. In one turn of the citric acid cycle, how many steps in the metabolism of oxaloacetate and acetyl-CoA involve net carboxylic acid oxidation? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

25. Atherosclerosis is a condition characterized by poor metabolism of cholesterol, which is conveyed by lipoproteins. Please indicate the lipoproteins causing the development of this disease: (A) LDL (B) HDL (C) VLDL (D) Chylomicrons (E) Triglycerides

26. Gluconeogenesis is induced in die liver alter severe physical activity. Which chemical is largely used in gluconeogenesis in this case? (A) alanine (B) glucose (C) glutamate (D) lactate (E) pyruvate

27. An enzyme that follows standard Michaelis-Menten kinetics was assayed for reaction velocity at various substrate concentrations. The data are shown below: Based on these kinetic data for the enzyme, what would be the closest estimate of the enzyme's Km value? (A) 2.0mM (B) 1.0mM (C) 250mM (D) 0.5 mM (E) 3.0mM

28. Orotate is converted to what two nucleotides which are used in nucleic acid synthesis? (A) AMP andGMP (B) TMP andCMP (C) UMPandAMP (D) GMP andCMP (E) CMP and AMP

29. How many di施rent reactions involve substrate-level phosphorylation during glycolysis? (A) 2 (B) 3 (C) 4 (D) 5 (E) 0

30. Uncoupling in mitochondria refers to: (A) Stopping electron flow but not stopping ATP synthesis. (B) Stopping ATP synthesis but not stopping electron flow. (C) Blocking the electrons ftom NADH from entering the electron transport system. (D) Interruption of electron flow. (E) None of the above.

31. Which of the following description of membrane potential is false? (A) Resting potential in neurons means when membrane potential became 0 mV. (B) Postsynaptic potentials are graded, and action potentials are all-or-none. (C) Hypetpolarization means membrane potential became more negative. (D) Under physiological condition, Na+ ions entering cells will cause depolarization. (E) Membrane potential is the result of differential ion concentration across plasma membrane of die cell.

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

113年 - 113 學士後醫學系招生考試試題：普通生物及生化概論#119349

113年 - 113 國立中山大學_學士後醫學系招生考試：普通生物及生化概論#119279

112年 - 112 學士後醫學系招生考試:普通生物及生化概論#114226

112年 - 112 國立中興大學_學士後醫學系招生考試試題_學士後醫學系甲、乙組：普通生物及生化概論#113984