42. Would you agree with the statement that the centrosome plays a key role in determining the rates of lengthening and shorting of the microtubules of an animal cell?
(A) Yes
(B) No

43. Would you expect the greenhouse effect (an increase in the CO2 content of the atmosphere) to have a greater effect on C4 plants or C3 plants? (A) C4 plants (B) C3 plants

44. How does the p53 gene protect against the development of cancer? (A) The p53 is normally expressed at a high level but this decrease if the DNA is damaged. (B) If the DNA is not repaired, the p53 gene can induce apoptosis of the cell. (C) The p53 protein can activate genes that cause the inhibition of the cyclin-dependent kinases which are needed for the cell to proceed through the restriction point in S phase.

45. Molecular weight analysis of a protein yields the following information: (Guanidinium chloride is a chaotropic (denaturing) reagent and 2-mercaptoethanol can reduce disulfide bonds.)What can you deduce about the protein's quaternary structure? (A) Dimer of 100,000-M.. (B) Each 100,000-M. unit is dimer of a 25,000-M, and 75,000-M, protein jointly covalently by disulfide bonds. (C) Dimer of a 25,000-M, and 75,000-M, protein. (D) Monomer of 200,000-M..

46. All of the following can be true of cloning vectors EXCEPT that they (A) are plasmid that slip into a host cell. (B) are plasmids that accept foreign DNA.(C) can be engineered to contain multiple cloning sites. (D) are portions of the main bacterial chromosome. (E) can be viruses.

47. All of the following are involved in Polymerase Chain Reaction (PCR) EXCEPT (A) free nucleotides. (B) DNA templates. (C) high temperature. (D) RNA polymerase. (E) low temperature.

48. Which is false about the wobble effect? (A) It explains why and how there can be fewer than 64 kinds of transfer RNA molecules. (B) It allows the third codon to vary if the first two codons in the anticodon follow the base-pair rule. (C) It indicates that transfer RNA combines with either the small or large subunit of ribosomes. (D) It permits certain amino acids to be specified by more than one codon.

49. The value of inserting human genes suspected of causing Alzheimer disease into mice is to (A) make mice act more human. (B) make antibodies, which can be injected into suffering patients. (C) develop mice that can serve as models for study of this condition. (D) use the mice for production of a vaccine foe the disease.

50. The oxygen released in photosynthesis comes from (A) carbon dioxide. (B) glucose. (C) ribulose bisphosphate. (D) water. (E) atmospheric oxygen.

1. 當有一位中年人來驗光時,你發現他右眼鼻側有一含有血管的三角形膜狀物,其尖端緩慢向角膜中央生長,這時你判斷可能是出什麼問題?並協助轉介給眼科專科醫師: (A) 慢性輪部角膜炎 (B) 角膜血管翳 (C) 臉裂症 (D) 翼狀贅片

2. 下列瞳孔擴張劑,何者作用時間最短? (A) Cyclopentolate (B) Tropicamide (C) Atropine (D) Ecothiophate

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