【全部】 - 學士後西醫-普通生物及生化概論2024~2020難度:(61~80)-阿摩線上測驗

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【全部】 - 學士後西醫-普通生物及生化概論2024~2020難度:(61~80)

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1(A).

9. Which one of the following nutrient cycle is important for photosynthetic organisms?
(A) Water cycle
(B) Nitrogen cycle
(C) Carbon cycle
(D) Phosphorus cycle
(E) Sulfur cycle

2(A).

17. In the active site of chymotrypsin, which of the following is the amino acid residue arrangement order of the catalytic triad?
(A) Asn…Lys…His
(B) Asp…His…Ser
(C) His…Asp…Tyr
(D) Asn…Ser…Cys
(E) His…Cys…Asp

3(A).

18. Which of the following is a DNA sequence?
(A) Coactivator
(B) Corepressor
(C) Enhancer
(D) Inducer
(E) Transactivator

4(A).

40. Which one of the following plant could be more likely to adapt hot and arid environments? 1. Arabidopsis 2. Rice 3. Sugarcane 4. Pineapple 5. Cactus
(A) 1,2
(B) 1,2,3
(C) 1,2,5
(D) 3,4,5
(E) 1,2,3,4,5

5(A).

45. In temperate regions, which pigment is responsible for the red-yellow coloration seen in leaves during the color change in autumn?
(A) Chlorophyll a
(B) Chlorophyll b
(C) Carotenoids
(D) Porphyrin
(E) Anthocyanin

6(A).

57. In flowering plant, which one of the following is reflected to be an important plant hormone that helps plants adapt with environmental stresses?
(A) Auxin
(B) Cytokinin
(C) Ethylene
(D) Abscisic acid
(E) Prostaglandin

7(A).

65. Pyruvate is oxidized to produce ________, which further reacts with ________ to produce ________ during the citric acid cycle.
(A) citrate; fumarate; α-ketoglutarate
(B) citrate; isocitrate; α-ketoglutarate
(C) acetyl-CoA; oxaloacetate; citrate
(D) acetyl-CoA; malate; oxaloacetate
(E) malate; citrate; acetyl-CoA

8(A).

82. Which of these statements about enzyme-catalyzed reactions is false?

(A) The V_max of a reaction can be attained at saturated concentration of substrate, even in the presence of a competitive inhibitor.

(B) At saturating levels of substrate, the rate of an enzyme-catalyzed reaction is proportional to the enzyme concentration.

(D) The Michaelis-Menten constant K_m equals the [S] at which v = 1/2 V_max.

(E) The activation energy for the catalyzed reaction is the same as for the uncatalyzed reaction, but the equilibrium constant is more favorable in the enzyme-catalyzed reaction.

9(A).

7. Which description about digestive system is FALSE?
(A) Pantothenic acid, a component of coenzyme A, causes fatigue in deficiency.
(B) Magnesium, an enzyme cofactor, causes nervous system disturbance in deficiency.
(C) Cholecystokinin (CCK) stimulates the release of enzyme from pancreas.
(D) Leptin, produced by adipose tissue, stimulates appetite.
(E) None of the above

10(A).

22. Which one of these characteristics is FALSE for the α-helix in protein?
(A) There are 3.6 amino acids per turn.
(B) There is a requirement for glycine in every third amino acid residue.
(C) A H-bond forms between the carbonyl oxygen of the amino acid residue and the amido proton of the amino acid residue.
(D) Proline is typically not found in the α-helix.
(E) A single turn of the helix extends about 5.4 Å along the long axis.

11(A).

54. Which of the following is NOT related to the parasympathetic nervous system?
(A) Lacrimal glands that produce tears
(B) Fight or flight responses
(C) Nerves in the stomach and trunk
(D) Nerves that go to the bladder
(E) Nerves and blood vessels responsible for the male erection

12(A).

67. Which of the following statements about microRNAs (miRNAs) are CORRECT? ① miRNAs originate from exogenous dsRNA. ② miRNAs form a perfect complementary to its target mRNA. ③ Some miRNAs can functionally inhibit mRNA translation. ④ Some miRNAs can promote mRNA decay. ⑤ miRNAs are transcribed by RNA polymerase III.
(A) ①,⑤
(B) ②,③
(C) ③,④
(D) ②,④
(E) ③,⑤

13(A).

78. In order to infect cells, the hemagglutinin of the influenza virus binds with ______ in the cell surface glycoproteins or glycolipids.
(A) sialic acid
(B) gluconic acid
(C) N-acetylmuramic acid
(D) uronic acid
(E) muramic acid

14(A).

65. Which statement for hemoglobin (the oxygen-binding protein in red blood cells) is FALSE?
(A) Hemoglobin exists in T and R states and R state prefers to bind oxygen.
(B) Oxygen binding converts hemoglobin from T to R state.
(C) Oxygen binding to hemoglobin is both allosteric and cooperative.
(D) Hemoglobin also binds H+ and CO2 to lessen the affinity for O2.
(E) Oxygen binding is also regulated by 2,3-bisphosphoglycerate, which stabilizes R state.

15(A).

67. Which of the following receptors and their types does NOT match?
(A) Insulin receptor is a G-protein-coupled receptor.
(B) Epidermal growth factor receptor is a receptor tyrosine kinase.
(C) Acetylcholine receptor is a gated ion channel.
(D) Integrin receptor is an adhesion receptor.
(E) Steroid receptor is a nuclear receptor.

16(A).

82. Which of the following products are produced by the β-oxidation of fatty acid? ① FADH₂ ② NAD+ ③ NADH ④ NADPH ⑤Acetyl-CoA
(A) ①②⑤
(B) ①③⑤
(C) ①④⑤
(D) ②③⑤
(E) ②④⑤

17(A).

86. Which pair of enzymes is involved in glycolysis but NOT in gluconeogenesis?
(A) Hexokinase and phosphohexose isomerase
(B) Phosphofructokinase and pyruvate kinase
(C) Phosphofructokinase and phosphoglycerate kinase
(D) Phosphoglycerate kinase and pyruvate kinase
(E) Phosphoglycerate mutase and enolase

18(A).

88. The functions of cholesterol include all the following except:
(A) A precursor of bile
(B) A precursor of vitamin D
(C) As an intracellular energy source
(D) Sustain cell membrane structure
(E) Essential for producing steroid hormone

19(A).

1. Which of the following organs is found in bryophytes?
(A) Roots
(B) Leaves
(C) Seeds
(D) Flagellated sperm
(E) Lignified cell walls

20(A).

11. Which of the following cycles involves the weathering of rocks?
(A) Nitrogen cycle
(B) Phosphorus cycle
(C) Carbon cycle
(D) Oxygen cycle
(E) Sulfur cycle