中山大学考研细胞生物学试题(416道选择题)
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C、生长和代谢活动旺盛的细胞线粒体数量多&&&& D、在细胞内的需能部位线粒体比较集中
316、叶绿体中与吸收和转化光能有极密切关系的结构是( B )
A、叶绿体由双层单位膜包围着&&&&&& B、在类囊体膜上分布着色素和酶
C、类囊体的内腔中含有水&&&&&&&&&& D、基质中含有酶、DNA和RNA
317、具有独立遗传系统的细胞器是( A )
A、叶绿体&&&& B、溶酶体&&&& C、核糖体&&&&& D、内质网
318、在光合作用中，光化学反应的中心分子是( B )
A、全部叶绿素a的各种状态分子&&&& B、P700和P680的叶绿素a分子??
C、与光合作用有关的酶分子&&&&&&&& D、全部叶绿素和类胡萝卜素分子
319、下列RNA在细胞内含量最高的是（ B ）
A、tRNA&&&&& B、rRNA&&&&& C、mRNA&&&& D、mtRNA& ?
320、真核细胞中不同染色质的DNA与组蛋白的组成比例总是（ A ）
A、1：1&&& B、1：2&& C、2：1&&& D、3：1 ?
321、不在核仁中转录的rRNA是( A )rRNA?
A、5S&&&&& B、5.8S&&&& C、18S&&&& D、28S ?
322、M期细胞和G2期细胞融合诱导出的PCC形态为（ D ）
A、棒状&&& B、单条线状&&& C、粉碎状&&& D、双线状
323、真核生物中，rRNA包括（ D ）
A、28S、23S、5S&&&&&&&&&& B、23S、16S、5S?
C、23S、18S、5.8S&&&&&&&& D、28S、18S、5.8S、5S ?
324、M期细胞和G1期细胞融合诱导出的PCC形态为（ B ）
A、棒状&&& B、单线状&&& C、粉碎状&&& D、双线状& ?
325、在染色质中能够找到组蛋白的细胞是（ C ）?
A、原核细胞&&& B、红细胞&&&& C、真核细胞&&& D、噬菌体 ?
326、M期细胞和S期细胞融合诱导出的PCC形态为（ C ）
A、棒状&&& B、单条线状&&& C、粉碎状&&& D、双线状 ?
327、下列关于细胞核功能的叙述中，最本质的是( D )?
A、细胞核与生物的遗传和变异有关&&&&& B、细胞进行有丝分裂时，核先分裂?
C、细胞核与生命的延续性密切相关&&&&& D、细胞核是遗传物质贮存和复制的场所 ?
328、观察染色体的最好时期是( C )?
A、间期&&&& B、前期&&&& C、中期&&&& D、后期 ?
329、下列细胞中核仁较小的是( C )?
A、胰腺细胞&&&&& B、肿瘤细胞?
C、神经细胞&&&&& D、胚胎细胞 ?
330、核糖体亚单位在下列哪一结构中形成( A )?
A、核仁&&& B、核基质&&& C、细胞质基质&&&& D、内质网
331、细胞进行有丝分裂时，形成纺锤丝的基本构成物质是( B )
A、微丝&&& B、微管&&& C、中间纤维&& D、微梁
332、与肌肉收缩有关的细胞骨架纤维是（B）
A、MT&&&&& B、MF&&&& C、IF&&& D、微梁
333、细胞的骨架系统是由一系列特异的( A )构成的网架系统。
A、结构蛋白质&&& B、功能蛋白质&&& C、糖蛋白&&&& D、脂蛋白
334、为微管组装起促进作用的是（C）
A、MTOC&&&&& B、MAPs&&&& C、GTP&&& D、ATP
335、在细胞增殖周期中，S期最主要的特征是（ A ）
A、DNA的合成&&&&&& B、蛋白质的合成?
C、RNA的合成&&&&&& D、染色体形成 ?
336、下列叙述错误的是（ D ）
A、肌细胞的肌质网膜上存在Ca2+-ATP酶，它具有把Ca2+从细胞质运到肌质网内的功能
B、mRNA合成从DNA模板的3&末端向5&末端方向移动进行，而翻译过程则是从mRNA模板的5&末端向3&末端进行
C、单独存在的病毒不能繁殖
D、细胞分裂后就暂不发生生化代谢变化，休止在G1期
337、泰-萨氏病（Tay-Sachs）是因为病人的脑组织细胞的溶酶体中缺乏（ B ）
A、&-半乳糖苷酶&&& B、氨基己糖苷酯酶A&&& C、&-半乳糖苷酶&&& D、神经鞘磷脂酶
338、小肠上皮微绒毛和应力纤维分别与哪种细胞骨架有关（ ）
A、微丝，中间纤维&&& B、微管，中间纤维&&& C、微丝，微管&&& D、微丝，微丝
339、下列微管结合蛋白中只存在于树突的是（ B ）
A、MAP1&&& B、MAP2&&& C、MAP4&&&& D、tau蛋白
340、微管可装配成三联管，三联管有多少原纤维组成（ D ）
A、39&&&&& B、37&&&&& C、35&&&&& D、33
341、在细胞周期G2期，细胞核的DNA含量为G1期的（ D ）?
A、1／2倍&&& B、1倍&&& C、不变&&& D、2倍 ?
&&&&&&13&&&&&
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09:18:55 免费考研网 阅读(1082) 评论(0)以下试题来自：
单项选择题微管可装配成三联管，三联管有多少原纤维组成（）
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D、tau蛋白
A、&-半乳糖苷酶
B、氨基己糖苷酯酶A
C、&-半乳糖苷酶
D、神经鞘磷脂酶
A、肌细胞的肌质网膜上存在Ca2+-ATP酶，它具有把Ca2+从细胞质运到肌质网内的功能
B、mRNA合成从DNA模板的3&末端向5&末端方向移动进行，而翻译过程则是从mRNA模板的5&末端向3&末端进行
C、单独存在的病毒不能繁殖
D、细胞分裂后就暂不发生生化代谢变化，休止在G1期
A、DNA的合成
B、蛋白质的合成
C、RNA的合成
D、染色体形成细胞学与生物化学模拟考试练习5 - 调查报告 - 问卷星
A．diffusion.§B．endocytosis.§C．phosphorylation.§D．facilitated diffusion§E．Osmosis.¤A．Inability of the peptide to exit the endoplamice reticulum lumen after translocation§B．Failure of preprotein translocation into the endoplasmic reticulum§C．Directing of prepro-alpha1(V)-collagen from the Golgi apparatus to the endoplamice reticulum (ER)§D．Sorting to the lysosomes§E．Increased release of collagen¤A．tropomyosin§B．myosin§C．G-actin§D．F-actin§E．Troponin¤A．溶酶体形成§B．多糖合成§C．物质的细胞内运输§D．微体形成§E．多肽合成¤A．星微管§B．极微管§C．动粒微管§D．游离微管§E.
微丝¤A．黏着带§B．黏着斑§C．桥粒§D．半桥粒§E．紧密连接¤A．紧密连接§B．半桥粒§C．桥粒§D．间隙连接§E.
黏着连接¤A．39§B．36§C．33§D．30§E. 以上都不对¤A．Membrane synthesis in the endoplasmic reticulum§B．Membrane modification in the Golgi apparatus§C．Presence of carbohydrates on the cytoplasmic surface§D．The distribution of cholesterol§E．Flipping proteins between the leaflets of the lipid bilayer (“filp-flop”)¤A．double bonds between carbon atoms in the fatty acid tails§B．steroid lipids at certain temperatures§C．poor alignment of the fatty acids tails§D．cholesterol at certain temperatures§E．all of the above¤A．Stimulating aggregation of proteins.§B．Contributing folding information to the native protein.§C．Controlling the docking of the signal peptide with its receptor on the rough endoplasmice reticulum (ER).§D．Inhibiting proteolytic activity of misfolded proteins.§E．Using their ATPase activity to bind and release themselves from hydrophobic regions of the protein.¤A．central vacuole§B．peroxisome§C．nucleoid region§D．mitochondrion§E．flagellum¤A．G1期§B．S期§C．G2期§D．M期§E．G0期¤A．hydrophilic§B．hydrophobic§C．bipolar§D．all of the above§E．none of the above¤A．RER§B．Microtubule§C．Golgi complex.§D．Smooth endoplasmic reticulum.§E． Lysosome¤A．thylakoids§B．mitochondrial surface§C．chloroplast surface§D．inner mitochondrial membrane§E．none of the above¤A．kinetome§B．kinetochore§C．telomere§D．centrosome§E．Satellite¤A．Each peroxisome is enclosed by a double membrane.§B．They contain their own DNA.§C．They contain oxidative enzymes.§D．Both A and C§E. None of the above¤A．微丝§B．微管§C．中间纤维§D．以上都是§E. 以上都不对¤A．是与核DNA密码略有不同的环状DNA§B．环状DNA§C．线状DNA§D．与核DNA密码略有不同的线状DNA§E．线粒体DNA含线粒体中全部蛋白的遗传信息
A．diffusion.§B．endocytosis.§C．phosphorylation.§D．facilitated diffusion§E．Osmosis.¤A．Inability of the peptide to exit the endoplamice reticulum lumen after translocation§B．Failure of preprotein translocation into the endoplasmic reticulum§C．Directing of prepro-alpha1(V)-collagen from the Golgi apparatus to the endoplamice reticulum (ER)§D．Sorting to the lysosomes§E．Increased release of collagen¤A．tropomyosin§B．myosin§C．G-actin§D．F-actin§E．Troponin¤A．溶酶体形成§B．多糖合成§C．物质的细胞内运输§D．微体形成§E．多肽合成¤A．星微管§B．极微管§C．动粒微管§D．游离微管§E.
微丝¤A．黏着带§B．黏着斑§C．桥粒§D．半桥粒§E．紧密连接¤A．紧密连接§B．半桥粒§C．桥粒§D．间隙连接§E.
黏着连接¤A．39§B．36§C．33§D．30§E. 以上都不对¤A．Membrane synthesis in the endoplasmic reticulum§B．Membrane modification in the Golgi apparatus§C．Presence of carbohydrates on the cytoplasmic surface§D．The distribution of cholesterol§E．Flipping proteins between the leaflets of the lipid bilayer (“filp-flop”)¤A．double bonds between carbon atoms in the fatty acid tails§B．steroid lipids at certain temperatures§C．poor alignment of the fatty acids tails§D．cholesterol at certain temperatures§E．all of the above¤A．Stimulating aggregation of proteins.§B．Contributing folding information to the native protein.§C．Controlling the docking of the signal peptide with its receptor on the rough endoplasmice reticulum (ER).§D．Inhibiting proteolytic activity of misfolded proteins.§E．Using their ATPase activity to bind and release themselves from hydrophobic regions of the protein.¤A．central vacuole§B．peroxisome§C．nucleoid region§D．mitochondrion§E．flagellum¤A．G1期§B．S期§C．G2期§D．M期§E．G0期¤A．hydrophilic§B．hydrophobic§C．bipolar§D．all of the above§E．none of the above¤A．RER§B．Microtubule§C．Golgi complex.§D．Smooth endoplasmic reticulum.§E． Lysosome¤A．thylakoids§B．mitochondrial surface§C．chloroplast surface§D．inner mitochondrial membrane§E．none of the above¤A．kinetome§B．kinetochore§C．telomere§D．centrosome§E．Satellite¤A．Each peroxisome is enclosed by a double membrane.§B．They contain their own DNA.§C．They contain oxidative enzymes.§D．Both A and C§E. None of the above¤A．微丝§B．微管§C．中间纤维§D．以上都是§E. 以上都不对¤A．是与核DNA密码略有不同的环状DNA§B．环状DNA§C．线状DNA§D．与核DNA密码略有不同的线状DNA§E．线粒体DNA含线粒体中全部蛋白的遗传信息
选择条件：
1.Threonine, an amino acid, and arabinose, a monosaccharide, cross the cell membrane down their concentration gradients by:2.A 21-year-old woman with a history of thin, hyperextensible skin with easy bruising, subcutanseous hematomas, atrophic scarring with large "cigarette paper scars", generalized tissue fragility, and joint hypermobility is referred to the genetics and metabolism division of the internal medicine deparment. Mutations are found in the COL5A1 gene i a region specially encoding the signal peptide domain of prepro-alpha1(V)-collagen chain. Which one of the following will directly result from this loss of function mutation?3.Among the constituents of muscle fibers, [
] of the following items play regulation function.4.高尔基体不直接参与5.有丝分裂后期，染色体向两端移动，主要是靠(
)的收缩。6.细胞内中间纤维通过(
)连接方式，可将整个组织的细胞连成一个整体。7.胰腺腺泡的细胞合成和分泌功能强的消化酶。酶分泌到腺泡腔，然后流入胰腺的导管，最终流入肠。这些酶的向后渗漏能引起自消化。您预计在胰腺腺泡细胞间通过何种连接阻止酶的向后渗漏？8.微管可装配成三联管，三联管有多少原纤维组成9.The asymmetry of the cell membrane is established primarily by which one of the following? [
]<option value='.Fluidity of phospholipid bilayer is increased by<option value='.A 65-year-old man present to the neurology clinic with a several year history in which he has less and less energy and spontaneity, memory loss (especially recent events), and mood swings. He is described by his wife as uncharacteristically slow to learn and react, confused, getting lost easily, exercising poor judgment, and shying away from anything new-preferring the familiar. He scores poorly on the mini-mental status examination. This disease is believed to be caused by protein misfolding. Chaperonins regulate protein folding in which of the following ways?<option value='.Which of these structures is unique to plant cells?<option value='.放线菌素D是DNA聚合酶合成抑制剂，如果培养的肿瘤细胞株中加入此试剂，则细胞不能进入()。<option value='.The lipids in the bilayer have tails that are ()<option value='.Which of the following is NOT part of the endomembrane system?<option value='.Oxysome of F0-F1 particles occur on<option value='.Which is the structure located at the center of the primary constriction of sister chromatin ?<option value='.Which of the following about peroxisomes is true?<option value='.细胞进行有丝分裂时，形成纺锤丝的基本构成物质是<option value='.下列说法中，哪一种描述线粒体DNA较为确切？
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自变量：（不超过2个题，一般为样本属性。例如性别和年龄）
因变量：（您要分析的目标题目，不超过10个题）
添加自变量
1.Threonine, an amino acid, and arabinose, a monosaccharide, cross the cell membrane down their concentration gradients by:2.A 21-year-old woman with a history of thin, hyperextensible skin with easy bruising, subcutanseous hematomas, atrophic scarring with large "cigarette paper scars", generalized tissue fragility, and joint hypermobility is referred to the genetics and metabolism division of the internal medicine deparment. Mutations are found in the COL5A1 gene i a region specially encoding the signal peptide domain of prepro-alpha1(V)-collagen chain. Which one of the following will directly result from this loss of function mutation?3.Among the constituents of muscle fibers, [
] of the following items play regulation function.4.高尔基体不直接参与5.有丝分裂后期，染色体向两端移动，主要是靠(
)的收缩。6.细胞内中间纤维通过(
)连接方式，可将整个组织的细胞连成一个整体。7.胰腺腺泡的细胞合成和分泌功能强的消化酶。酶分泌到腺泡腔，然后流入胰腺的导管，最终流入肠。这些酶的向后渗漏能引起自消化。您预计在胰腺腺泡细胞间通过何种连接阻止酶的向后渗漏？8.微管可装配成三联管，三联管有多少原纤维组成9.The asymmetry of the cell membrane is established primarily by which one of the following? [
]<option value='.Fluidity of phospholipid bilayer is increased by<option value='.A 65-year-old man present to the neurology clinic with a several year history in which he has less and less energy and spontaneity, memory loss (especially recent events), and mood swings. He is described by his wife as uncharacteristically slow to learn and react, confused, getting lost easily, exercising poor judgment, and shying away from anything new-preferring the familiar. He scores poorly on the mini-mental status examination. This disease is believed to be caused by protein misfolding. Chaperonins regulate protein folding in which of the following ways?<option value='.Which of these structures is unique to plant cells?<option value='.放线菌素D是DNA聚合酶合成抑制剂，如果培养的肿瘤细胞株中加入此试剂，则细胞不能进入()。<option value='.The lipids in the bilayer have tails that are ()<option value='.Which of the following is NOT part of the endomembrane system?<option value='.Oxysome of F0-F1 particles occur on<option value='.Which is the structure located at the center of the primary constriction of sister chromatin ?<option value='.Which of the following about peroxisomes is true?<option value='.细胞进行有丝分裂时，形成纺锤丝的基本构成物质是<option value='.下列说法中，哪一种描述线粒体DNA较为确切？
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添加因变量 1.Threonine, an amino acid, and arabinose, a monosaccharide, cross the cell membrane down their concentration gradients by:2.A 21-year-old woman with a history of thin, hyperextensible skin with easy bruising, subcutanseous hematomas, atrophic scarring with large "cigarette paper scars", generalized tissue fragility, and joint hypermobility is referred to the genetics and metabolism division of the internal medicine deparment. Mutations are found in the COL5A1 gene i a region specially encoding the signal peptide domain of prepro-alpha1(V)-collagen chain. Which one of the following will directly result from this loss of function mutation?3.Among the constituents of muscle fibers, [
] of the following items play regulation function.4.高尔基体不直接参与5.有丝分裂后期，染色体向两端移动，主要是靠(
)的收缩。6.细胞内中间纤维通过(
)连接方式，可将整个组织的细胞连成一个整体。7.胰腺腺泡的细胞合成和分泌功能强的消化酶。酶分泌到腺泡腔，然后流入胰腺的导管，最终流入肠。这些酶的向后渗漏能引起自消化。您预计在胰腺腺泡细胞间通过何种连接阻止酶的向后渗漏？8.微管可装配成三联管，三联管有多少原纤维组成9.The asymmetry of the cell membrane is established primarily by which one of the following? [
]<option value='.Fluidity of phospholipid bilayer is increased by<option value='.A 65-year-old man present to the neurology clinic with a several year history in which he has less and less energy and spontaneity, memory loss (especially recent events), and mood swings. He is described by his wife as uncharacteristically slow to learn and react, confused, getting lost easily, exercising poor judgment, and shying away from anything new-preferring the familiar. He scores poorly on the mini-mental status examination. This disease is believed to be caused by protein misfolding. Chaperonins regulate protein folding in which of the following ways?<option value='.Which of these structures is unique to plant cells?<option value='.放线菌素D是DNA聚合酶合成抑制剂，如果培养的肿瘤细胞株中加入此试剂，则细胞不能进入()。<option value='.The lipids in the bilayer have tails that are ()<option value='.Which of the following is NOT part of the endomembrane system?<option value='.Oxysome of F0-F1 particles occur on<option value='.Which is the structure located at the center of the primary constriction of sister chromatin ?<option value='.Which of the following about peroxisomes is true?<option value='.细胞进行有丝分裂时，形成纺锤丝的基本构成物质是<option value='.下列说法中，哪一种描述线粒体DNA较为确切？
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第1题：Threonine, an amino acid, and arabinose, a monosaccharide, cross the cell membrane down their concentration gradients by:&&[单选题]选项小计比例A．diffusion.611.54%B．endocytosis.23.85%C．phosphorylation.917.31%D．facilitated diffusion&(答案)3057.69%E．Osmosis.59.62%本题有效填写人次52第2题：A 21-year-old woman with a history of thin, hyperextensible skin with easy bruising, subcutanseous hematomas, atrophic scarring with large "cigarette paper scars", generalized tissue fragility, and joint hypermobility is referred to the genetics and metabolism division of the internal medicine deparment. Mutations are found in the COL5A1 gene i a region specially encoding the signal peptide domain of prepro-alpha1(V)-collagen chain. Which one of the following will directly result from this loss of function mutation?&&[单选题]选项小计比例A．Inability of the peptide to exit the endoplamice reticulum lumen after translocation59.62%B．Failure of preprotein translocation into the endoplasmic reticulum&(答案)2140.38%C．Directing of prepro-alpha1(V)-collagen from the Golgi apparatus to the endoplamice reticulum (ER)2344.23%D．Sorting to the lysosomes00%E．Increased release of collagen35.77%本题有效填写人次52第3题：Among the constituents of muscle fibers, [
] of the following items play regulation function.&&[单选题]选项小计比例A．tropomyosin917.31%B．myosin&(答案)2242.31%C．G-actin1325%D．F-actin11.92%E．Troponin713.46%本题有效填写人次52第4题：高尔基体不直接参与&&[单选题]选项小计比例A．溶酶体形成23.85%B．多糖合成1223.08%C．物质的细胞内运输59.62%D．微体形成917.31%E．多肽合成&(答案)2446.15%本题有效填写人次52第5题：有丝分裂后期，染色体向两端移动，主要是靠(
)的收缩。&&[单选题]选项小计比例A．星微管611.54%B．极微管47.69%C．动粒微管&(答案)2344.23%D．游离微管47.69%E.
微丝1528.85%本题有效填写人次52第6题：细胞内中间纤维通过(
)连接方式，可将整个组织的细胞连成一个整体。&&[单选题]选项小计比例A．黏着带1019.23%B．黏着斑815.38%C．桥粒&(答案)2344.23%D．半桥粒35.77%E．紧密连接815.38%本题有效填写人次52第7题：胰腺腺泡的细胞合成和分泌功能强的消化酶。酶分泌到腺泡腔，然后流入胰腺的导管，最终流入肠。这些酶的向后渗漏能引起自消化。您预计在胰腺腺泡细胞间通过何种连接阻止酶的向后渗漏？&&[单选题]选项小计比例A．紧密连接&(答案)4076.92%B．半桥粒35.77%C．桥粒35.77%D．间隙连接59.62%E.
黏着连接11.92%本题有效填写人次52第8题：微管可装配成三联管，三联管有多少原纤维组成&&[单选题]选项小计比例A．3959.62%B．36713.46%C．33&(答案)3567.31%D．3035.77%E. 以上都不对23.85%本题有效填写人次52第9题：The asymmetry of the cell membrane is established primarily by which one of the following? [
]&&[单选题]选项小计比例A．Membrane synthesis in the endoplasmic reticulum&(答案)1936.54%B．Membrane modification in the Golgi apparatus815.38%C．Presence of carbohydrates on the cytoplasmic surface917.31%D．The distribution of cholesterol35.77%E．Flipping proteins between the leaflets of the lipid bilayer (“filp-flop”)1325%本题有效填写人次52第10题：Fluidity of phospholipid bilayer is increased by&&[单选题]选项小计比例A．double bonds between carbon atoms in the fatty acid tails713.46%B．steroid lipids at certain temperatures59.62%C．poor alignment of the fatty acids tails815.38%D．cholesterol at certain temperatures815.38%E．all of the above&(答案)2446.15%本题有效填写人次52第11题：A 65-year-old man present to the neurology clinic with a several year history in which he has less and less energy and spontaneity, memory loss (especially recent events), and mood swings. He is described by his wife as uncharacteristically slow to learn and react, confused, getting lost easily, exercising poor judgment, and shying away from anything new-preferring the familiar. He scores poorly on the mini-mental status examination. This disease is believed to be caused by protein misfolding. Chaperonins regulate protein folding in which of the following ways?&&[单选题]选项小计比例A．Stimulating aggregation of proteins.917.31%B．Contributing folding information to the native protein.&(答案)1426.92%C．Controlling the docking of the signal peptide with its receptor on the rough endoplasmice reticulum (ER).1936.54%D．Inhibiting proteolytic activity of misfolded proteins.47.69%E．Using their ATPase activity to bind and release themselves from hydrophobic regions of the protein.611.54%本题有效填写人次52第12题：Which of these structures is unique to plant cells?&&[单选题]选项小计比例A．central vacuole&(答案)2446.15%B．peroxisome47.69%C．nucleoid region1223.08%D．mitochondrion47.69%E．flagellum815.38%本题有效填写人次52第13题：放线菌素D是DNA聚合酶合成抑制剂，如果培养的肿瘤细胞株中加入此试剂，则细胞不能进入()。&&[单选题]选项小计比例A．G1期59.62%B．S期&(答案)2751.92%C．G2期1426.92%D．M期00%E．G0期611.54%本题有效填写人次52第14题：The lipids in the bilayer have tails that are ()&&[单选题]选项小计比例A．hydrophilic59.62%B．hydrophobic&(答案)2650%C．bipolar917.31%D．all of the above1019.23%E．none of the above23.85%本题有效填写人次52第15题：Which of the following is NOT part of the endomembrane system?&&[单选题]选项小计比例A．RER47.69%B．Microtubule&(答案)3261.54%C．Golgi complex.47.69%D．Smooth endoplasmic reticulum.815.38%E． Lysosome47.69%本题有效填写人次52第16题：Oxysome of F0-F1 particles occur on&&[单选题]选项小计比例A．thylakoids35.77%B．mitochondrial surface47.69%C．chloroplast surface917.31%D．inner mitochondrial membrane&(答案)2955.77%E．none of the above713.46%本题有效填写人次52第17题：Which is the structure located at the center of the primary constriction of sister chromatin ?&&[单选题]选项小计比例A．kinetome713.46%B．kinetochore&(答案)2140.38%C．telomere1019.23%D．centrosome1019.23%E．Satellite47.69%本题有效填写人次52第18题：Which of the following about peroxisomes is true?&&[单选题]选项小计比例A．Each peroxisome is enclosed by a double membrane.611.54%B．They contain their own DNA.35.77%C．They contain oxidative enzymes.&(答案)2344.23%D．Both A and C1834.62%E. None of the above23.85%本题有效填写人次52第19题：细胞进行有丝分裂时，形成纺锤丝的基本构成物质是&&[单选题]选项小计比例A．微丝1121.15%B．微管&(答案)2548.08%C．中间纤维713.46%D．以上都是713.46%E. 以上都不对23.85%本题有效填写人次52第20题：下列说法中，哪一种描述线粒体DNA较为确切？&&[单选题]选项小计比例A．是与核DNA密码略有不同的环状DNA&(答案)3159.62%B．环状DNA1121.15%C．线状DNA35.77%D．与核DNA密码略有不同的线状DNA47.69%E．线粒体DNA含线粒体中全部蛋白的遗传信息35.77%本题有效填写人次52