The Solution for GRE Biochemistry Practice Test [81-100]
추천글 : 【GRE】 Solution for GRE Biology Practice Test
81. A genetic analysis of an unknown infectious agent reveals that it contains only the nucleotides G, A, U, and C in the proportion 30 percent, 35 percent, 15 percent, and 20 percent, respectively. Based on this information, this infectious agent is most likely a
⑴ answer: D
⑵ 샤가프의 법칙이 성립하지 않아 single-stranded이고, T 대신 U를 포함하므로 RNA virus
82. The most likely amino acid that would yield the below titration curve would be
⑴ answer: C
⑵ 당량점이 2개이므로 아민기와 카르복실기만 이온화 가능하고, 작용기는 이온화되지 않음 → 비전하 아미노산
⑶ Tyrosine은 기본 2개 외에 페놀성 OH가 하나 더 이온화되므로 제외
83. Pyruvate is LEAST likely to be used to synthesize which of the following?
⑴ answer: E
🄐 피루브산 산화 : 2 피루브산(3-C) → 2 CO2 + 2NADH + 2 아세틸 CoA(2-C)
🄑 알코올 발효
🄒 젖산 발효
🄔 HMP (PPP) 경로로서 포도당에서 동화작용이 일어나는 것
84. The technique of chromosome painting in the analysis of human karyotypes relies on which of the following?
⑴ answer: C
⑵ 핵형 분석
85. Which of the following is the origin of the majority of the ATP used in the pathway of gluconeogenesis?
⑴ answer: A
86. Which of the following enzymes would be most useful as a marker for chloroplasts during isolation of plant cell organelles?
⑴ answer: B
⑵ phosphoribulokinase (PRK) : Rubisco가 사용할 RuBP를 만들어주는 효소
⑶ 광합성 관련 효소를 찾는 문제
87. Which of the following best indicates that a segment of DNA is a gene?
⑴ answer: A
88. Which of the following events, occurring within a tandem repeat sequence, will cause an expansion or contraction of the array?
⑴ answer: C
⑵ 교차
89. Each repeat unit within the nuclear ribosomal gene cluster of eukaryotes (rDNA) contains
⑴ answer: A
90. Which is NOT a characteristic typical of retrotransposons?
⑴ answer: E
⑵ 레트로 트랜스포존 : mRNA → cDNA → 다른 DNA에 삽입
① 역전사효소를 암호화함
② 동물 유전체의 상당한 비율을 차지함
③ 유전체 내 무작위 삽입
④ 직접 반복서열에 의해 양쪽이 둘러싸임
91. The unfolded protein response involves all of the following EXCEPT
⑴ answer: E
⑵ protein folding과 관련된 샤페론은 번역 후 변형에 해당함
92. Proteasomes are responsible for the degradation of all of the following EXCEPT
⑴ answer: C
93. All of the following are possible fates of fatty acids that enter the liver EXCEPT
⑴ answer: C
⑵ 지질 분해
94. In the TCA cycle, citrate loses two of its six carbons as CO2 as it is converted to oxaloacetate. From the citrate structure shown below where all six carbons are numbered, which two carbons are lost as CO2?
⑴ answer: D
⑵ TCA 회로 (시트르산 회로)
⑶ 기본적으로 carboxylate를 고르는 것이나 1번 탄소는 고리에 포함돼 있으므로 제외
95. The coding region of a gene is 102 nucleotides long, including both start and stop codons. Which of the following would be the most likely effect of a single nucleotide deletion at position 76 in the coding region?
⑴ answer: E
⑵ 현재 해독틀에는 34개의 자리가 있고 26, 27, 28, 29, 30, 31, 32, 33번째 아미노산이 바뀌고 34번째는 아미노산이 아니라 종결 코돈
96. A eukaryotic translation complex during the elongation stage is represented by the diagam below. Which of the following labels on the diagram is NOT correct?
⑴ answer: E
⑶ 단백질은 N → C 방향으로 합성됨
97. An altered form of a replicative DNA polymerase lacks 3´ → 5´ exonuclease activity. This alteration would most likely result in which of the following?
⑴ answer: B
⑵ 5´ → 3´ 엑소뉴클레아제 : 말단 핵산 제거 기능
⑶ 3´ → 5´ 엑소뉴클레아제 : 교정 기능
98. Glycine can be formed from another amino acid in a single step. This reaction is catalyzed by
⑴ answer: E
99. When 50 μL of a 14C sample is added into 10 mL of scintillation cocktail, a liquid scintillation counter reports 15,200 counts per minute (cpm), with an efficiency of 0.92. Which of the following is closest to the number of disintegrations per minute (dpm) in the 50 μL sample?
⑴ answer: C
⑵ dpm = cpm / counting efficiency = 15,200 / 0.92 = 16521.74
100. Glucagon stimulates release of fatty acids from adipocytes because it
⑴ answer: C
⑵ 글루카곤
입력: 2026.04.18 06:36
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