将精原细胞的一个DNA分子用¹⁵N标记，并提供14N的原料，则该精原细胞产生的四个精子中没有放射性同位素15N的有

试卷相关题目

• 1假如水稻高秆（D）对矮秆（d）为显性，有芒（R）对无芒（r）为显性，两对性状独立遗传，用一个纯合矮秆有芒品种与一个纯合高秆无芒品种杂交，F2代中出现矮秆有芒型的基因型及其比例为

  A.ddRR 1/8

  B.ddRr 1/16

  C.ddRR 1/16和ddRr 1/8

  D.DDrr 1/16和DdRR 1/8

  开始考试点击查看答案
• 2在西葫芦的皮色遗传中，已知黄皮基因（Y）对绿皮基因（y）为显性，但在另一白色显性基因（W）存在时，则基因Y和y都不能表达。现有基因型WwYy的个体自交，其后代表现型种类及比例是

  A.4种，9：3：3：1

  B.2种，l3：3

  C.3种，l2：3：1

  D.3种，l0：3：3

  开始考试点击查看答案
• 3为了认识酶作用的特性，以20%过氧化氢溶液为反应底物的一组实验结果如下表。通过分析实验结果，能够得出相应的结论。在下列有关结论的描述中，从表中得不到实验依据的一项是<table border="1" cellspacing="0" cellpadding="0" width="100%" _dj="MsoNormalTable"><tbody><tr><td width="7%"> </td><td width="65%">处理方法</td><td width="26%">观察结果</td></tr><tr><td width="7%">1</td><td width="65%">常温下自然分解</td><td width="26%">氧气泡少而小</td></tr><tr><td width="7%">2</td><td width="65%">常温下加入两滴质量分数为3.5%的FeCl3</td><td width="26%">氧气泡稍多而小</td></tr><tr><td width="7%">3</td><td width="65%">常温下加入两滴质量分数为20%的新鲜猪肝研磨液</td><td width="26%">氧气泡极多而大</td></tr><tr><td width="7%">4</td><td width="65%">加入煮沸后冷却的新鲜猪肝研磨液</td><td width="26%">氧气泡少而小</td></tr></tbody></table>

  A.从催化反应条件看，酶有温和性

  B.从催化活性看，酶有催化性

  C.从催化反应效率看，酶有高效性

  D.从催化底物看，酶有专一性

  开始考试点击查看答案
• 4按下表设计进行实验。分组后，在相同的适宜条件下培养8～10小时，并对实验结果进行分析。下列叙述正确的是<table style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; MARGIN: auto auto auto 23.4pt; BORDER-COLLAPSE: collapse; BORDER-TOP: medium none; BORDER-RIGHT: medium none; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" border="1" cellspacing="0" cellpadding="0" _dj="MsoNormalTable"><tbody><tr style="HEIGHT: 18pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 61.8pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 18pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt" width="82">实验材料</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45.25pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 18pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="60">取样</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 79.4pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 18pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="106">处理</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 82.25pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 18pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="110" colspan="2">分组</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 46.3pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 18pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="62">培养液</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 18pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="72">供氧情况</td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 17.15pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 61.8pt; PADDING-RIGHT: 5.4pt; BACKGROUND: #cccccc; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="4" width="82">适宜浓度酵母菌液</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45.25pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="2" width="60">50mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 79.4pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="2" width="106">破碎细胞(细胞器完整)</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 38.55pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="51">甲</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 43.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="58">25mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 46.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="62">75mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="72">无氧</td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 17.15pt; mso-yfti-irow: 2"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 38.55pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="51">乙</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 43.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="58">25mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 46.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="62">75mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="72">通氧</td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 17.15pt; mso-yfti-irow: 3"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45.25pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="2" width="60">50mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 79.4pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="2" width="106">末处理</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 38.55pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="51">丙</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 43.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="58">25mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 46.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="62">75mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 17.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="72">无氧</td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 18pt; mso-yfti-irow: 4; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 38.55pt; PADDING-RIGHT: 5.4pt; HEIGHT: 18pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="51">丁</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 43.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 18pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="58">25mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 46.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 18pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="62">75mL</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 18pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="72">通氧</td></tr></tbody></table>

  A.甲组不产生CO₂而乙组产生

  B.甲组的酒精产量与丙组相同

  C.丁组能量转换率与丙组相同

  D.丁组的氧气消耗量大于乙组

  开始考试点击查看答案
• 5下列选项中，两类细胞的染色体数目均可呈周期性变化的是

  A.蛙的红细胞与淋巴细胞

  B.小鼠骨髓瘤细胞与杂交瘤细胞

  C.人的胚胎干细胞与成熟红细胞

  D.牛的精细胞与精原细胞

  开始考试点击查看答案
• 6某生物的体细胞的基因型为AABb，则A和A分离发生的时期为① 减I时期  ②减II时期  ③有丝分裂时期

  A.① ② ③

  B.①②

  C.② ③

  D.① ③

  开始考试点击查看答案
• 7在遗传信息的传递过程中，不可能发生的是

  A.DNA复制、转录及翻译过程都遵循碱基互补配对原则

  B.核基因转录形成的mRNA穿过核孔进入细胞质中进行翻译过程

  C.DNA复制、转录都是以DNA一条链为模板，翻译则是以mRNA为模板

  D.DNA复制、转录和翻译的原料依次是脱氧核苷酸、核糖核苷酸、氨基酸

  开始考试点击查看答案
• 8已知AUG、GUG为起始密码，UAA、UGA、UAG为终止密码。假设编码某多肽分子的基因中一条链的碱基排列顺序为ACCACAGTC……AGGAACTTCGAT（其中“……”表示省略了214个碱基，并且不含有编码终止密码的序列），若以此链为模板转录，最终形成的多肽分子中肽键的数目最多是

  A.74

  B.75

  C.77

  D.78

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• 9已知某DNA分子中G碱基的比例为25%，那么，由此DNA复制出来的某基因中，碱基C的比例是

  A.25%

  B.10%

  C.无法确定

  D.40%

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• 10某一DNA分子中，A为200个，复制数次后，消耗周围环境中含A的脱氧核苷酸3000个，该DNA分子已经复制了

  A.4次

  B.3次

  C.5次

  D.6次

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