【GR1222】 The Solution for GRE Biochemistry Practice Test [21-40]

The Solution for GRE Biochemistry Practice Test [21-40]

 

추천글 : 【GRE】 Solution for GRE Biology Practice Test

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21. DNA photolyase recognizes which of the following in order to repair pyrimidine dimers?

 

 

⑴ answer: A

⑵ 이량체 회복 메커니즘 

 

 

 

22. Which of the following is present in double-stranded cDNA but absent in the corresponding genomic DNA?

 

 

⑴ answer: A

⑵ 성숙 mRNA의 poly A tail과 관련 있음

 

 

23. Which of the following molecular genetic techniques is used to identify protein-protein interactions?

 

 

⑴ answer: A

⑵ 이중잡종체계 

 

 

24. Which of the following enzymes would prevent religation of a restriction enzyme-digested plasmid? 

 

 

⑴ answer: B

 

 

25. Which of the following molecules forms extracellular cross-linked fibrils of great tensile strength?

 

 

⑴ answer: A

⑵ 콜라겐 

 

 

26. Which of the following statements is correct concerning cell locomotion? 

 

 

⑴ answer: B

⑵ 액틴과 아메바 위족운동 

 

 

27. A wild-type E. coli strain was isolated from a local pond. After cultivation in the laboratory, cell-free culture medium from the strain was incubated with an arg^- auxotrophic lab strain. Arg⁺ colonies were readily isolated following the incubation. The lab strain produced no prototrophs when incubated alone. Which of the following is most likely responsible for the arg⁺ colonies obtained in the experiment?

 

 

⑴ answer: D

⑵ 형질도입(transduction)

 

 

28. In humans, maturing oocytes progress to metaphase of meiosis II and then arrest their development until fertilization. Which of the following would NOT be true of meiosis II—arrested oocytes?

 

 

⑴ answer: C

 

 

29. The rotation of the gamma subunit of the mitochondrial F₁ ATPase requires the presence of 

 

 

⑴ answer: A

⑵ ATP 합성효소 

 

 

30. For the equilibrium below, which of the following statements most accurately describes what occurs when the pH is increased (becomes more basic)?

 

 

⑴ answer: D

⑵ 화학평형 : 생성물인 proton의 감소로 정반응 우세. 평형상수는 일정

 

 

31. The most definitive method for determining if actin is a component of an isolated membrane preparation would be to analyze the membrane proteins by 

 

 

⑴ answer: E

⑵ 웨스턴 블롯팅은 단백질 서브유닛의 수 및 특정 분자량의 단백질의 존재 여부 등을 검출할 수 있음 

 

 

32. Which of the following metabolic processes occurs in the mitochondria?

 

 

⑴ answer: D

🄐 콜레스테롤 합성은 간 세포질 및 활면 소포체에서 일어남 

🄑 지방산 합성은 세포질에서 일어남

🄒 해당과정은 세포질에서 일어남

🄓 지방산 베타산화는 퍼옥시좀 또는 미토콘드리아에서 일어남

🄔 PPP 경로는 세포질에서 일어남

 

 

33. Which of the following sequences correctly portrays the flow of electrons during photosynthesis?

 

 

⑴ answer: E

⑵ 암반응과 캘빈 회로  

 

 

34. In the reaction catalyzed by hexokinase, the two half reactions and their ΔG°´ values are as follows.

 

 

The ΔG°´ for the conversion of glucose to glucose-6-P with ATP as the phosphoryl donor is 

 

 

⑴ answer: B

⑵ 해당과정 : glucose에서 glucose-6-P로 진행되는데 1 ATP만 관여하므로 ΔG°´ = -31 + 14 = -17 kJ/mol 

 

 

35. Which of the following statements does NOT explain how viruses often produce more proteins than would be predicted from the size of their genome?

 

 

⑴ answer: E

⑵ 바이러스 

 

 

36. In C. elegans, the P6p cell in the lateral hypodermis is normally adjacent to the anchor cell and divides three times to form part of the vulva. The anchor cell itself is not part of the vulva and does not divide. If P6p is destroyed, the adjacent P5p cell will divide three times and form the part of the vulva that P6p normally forms. However, if the anchor cell is destroyed, no cell forms the vulva. Which of the following statements best explains these results?

 

 

⑴ answer: B

⑵ “If the anchor cell is destroyed, no cell forms the vulva.”

 

 

37. A high-frequency burst of action potentials causes a change in the surface of the presynaptic membrane described as ruffling. Which of the following is the cause of the change?

 

 

⑴ answer: D

⑵ The more exocytosis (the more neurotransmitters), the more action potentials (the higher-freuqency).

 

 

38. Packaging of concatemeric lambda DNA into phage heads involves cleavage of the DNA at which of the following sites?

 

 

⑴ answer: A

 

 

39. All of the following are associated with vertebrate promoters located in active chromatin EXCEPT

 

 

⑴ answer: C

⑵ Methylated C^pG island, often found in promoters, inactivates chromatin.

 

 

40. A human female is heterozygous for the sex-linked genetic disease glucose-6-phosphate dehydrogenase (G6PD) deficiency. Half of her cells have normal levels of the G6PD enzyme and the other half have extremely low levels. This pattern of expression is an example of which of the following?

 

 

⑴ answer: C

 

입력: 2026.04.11 10:08