首都医科大学 WK<:(vu.
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2015首都医科大学博士入学考试-生物化学回忆版 6?C|pO
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一、名词解释(应该是5个,但是记不清是哪5个了) i:coNK)4
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1.chaperon 2.motif 3.allosteric enzyme 4.ribozyme 5.gluconeogenesis 6.sernicon servativereplication sOY+X
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二、选择题(很多题记不太清楚了,细节问题请包容) i6Kcj
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1.Which of the followingstatements concerning protein domains is true? T|o ]8z
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A.they are examples ofstructural motifs $gv3Up"U
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B.large polypeptide may beorganized into struoturally close but functionally independent units dN%*-p(
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C.the consist of separatepoly peptide chains(subunits) RiPxz=kr
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D.they have been found onlyin prokaryotic proteins fQkfU;5
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2.Prion disease aregenerally believed to a associated with I+4#LR3;
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A.infection by a RNA vins B.infection by DNA C.infection by protein D.infection by mRNA @5rl;C
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3.The secondary structureof transfer RNA is +~x'1*A_
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A.described as double helix B.described as reversed “L” C.described as cloverleaf D.present only ineukaryotic cells =1vl-*uYh
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4.In competitive inhibiyion 5p}ri,Y<
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A.Km not change,Vmax not change B.Km rise, Vmaxnot change C.Km not change,Vmax rise D.Km rise, Vmaxrise l
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5.The part og the RNApolymerase noloenzyme that initiates binding to DNA is called the 2I@d=T{K
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A.sigma factor B.intron C.ribosomal RNA D.core enzyme vh/&KTe?:
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6.Sunlight can damage DNAby IW{}l=D/
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A.making apyrimidinic sites B.causing spontaneousdeamination of bases AbExJ~JV\g
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C.forming pyrimidinedimmers D.alkylating DNA #lY_
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7.Which is therate-limiting enzyme, inregulation of the pentose phosphate pathway? K7-z.WTUR
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A.hexokinase B.6-phosphofructokinace-1 C.Clucose-6-phosphatedehydrogenase D.pyrurate dehydrogenase w:VD[\h
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8.Transcription is theprocess in which &Yklf?EZ>Q
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A.protein is synthesized from DNA B.DNA is replicated _yRD*2 !;
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C.RNA is synthesized from protein D.ENA is synthesized fromDNA `6:B0-r
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9.Which of the following isa sis-acting element? Ab
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A.RNA polymerase B.Enhancer C.transcriptionfactor I D.structural gene &~aS24c
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10.The protein that canbind to RNA and prevent the trascription is called `oU|U!|
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A.inducer B.repressor protein C.cis-acting element D.positive regulatoryproteins 9Wv}g"KY0
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11.蛋白质吸收紫外光的大小取决于 ]SmN}Iq1
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A.脂肪族氨基酸含量 B.酸性氨基酸含量 C.芳香族氨基酸含量 D. 蛋氨酸含量 p/U{*i]t
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12.DNA变性是指 !<3!ORFO
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A.分子中磷酸二酯键断裂 B.多核苷酸链解裂 C.DNA分子由超螺旋变为双键双螺旋 D.互补碱基之间氢键断裂 ^D76_'{
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13.关于关键酶的叙述哪项错误? a*&(cn
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A.关键酶常是变构酶 B.关键酶常位于代谢途径的起始或分叉部位 Sh2BU3
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C.关键酶是共价修饰酶 D.关键酶活性最高 \(MIDCZ@-
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14.下列哪个反应是三羧酸循环中的底物水平磷酸化反应: #g/m^8n?s
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A.异柠檬酸—α-酮戊二酸 B.琥珀酰COA—琥珀酸 C.琥珀酸—延胡索酸 D.延胡索酸—苹果酸 _G&gF.|
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15.体内贮存脂肪主要代谢来自 aaP6zJXi
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A.酮体 B.葡萄糖 C.脂肪酸 D.生糖氨基酸 @^Rl{p
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16.人体内CO2生成方式是: :(\JY?+w
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A.O2与C直接合成 B.O2与CO结合 C.有机酸的脱羧 D.一碳单位与O2结合 pC]XbokES
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