新物种形成的标志是                                    (    )

试卷相关题目

• 1噬菌体фX174是单链DNA生物，当它感染宿主细胞时，首先形成复制型（RF）的双链DNA分子。如果该生物DNA的碱基构成是：20%A，30%G，10T和40%C。那么，RF中的碱基构成情况是

  A.20%A，30%G，10%T和40%C

  B.15%A，35%G，15%T和35%C

  C.10%A，40%G，20%T和30%C

  D.35%A，15%G，35%T和15%C

  开始考试点击查看答案
• 2真核生物进行有性生殖时，通过减数分裂和随机受精使后代

  A.增加发生基因突变的概率

  B.产生不同于双亲的基因组合

  C.从双亲各获得一半的DNA

  D.继承双亲全部的遗传性状

  开始考试点击查看答案
• 3艾弗里等人的肺炎双球菌转化实验和赫尔希与蔡斯的噬菌体侵染细菌试验都证明了DNA是遗传物质。这两个实验在设计思路上的共同点是

  A.重组DNA片段，研究其表型效应

  B.诱发DNA突变，研究其表型效应

  C.设法把DNA与蛋白质分开，研究各自的效应

  D.应用同位素示踪技术，研究DNA在亲代与子代之间的传递

  开始考试点击查看答案
• 4下列有关红绿色盲症的叙述,正确的是

  A.红绿色盲症遗传不遵循基因的分离定律

  B.红绿色盲症是一种常染色体隐性遗传病

  C.红绿色盲症患者中女性多于男性

  D.近亲结婚导致红绿色盲症的发病率升高

  开始考试点击查看答案
• 5普通小麦中有高杆抗病和矮杆易感病两个品种，控制两对相对性状的基因分别位于两对同源染色体上。现用显性纯合子高秆抗病小麦和矮秆易感病小麦杂交得F₁，F₁自交或测交，预期结果不正确的是

  A.自交结果中高秆抗病与矮秆抗病比例为9：1

  B.自交结果中高秆与矮秆比例为3：1，抗病与易感病比例为3：l

  C.测交结果为矮秆抗病：矮秆易感病：高秆抗病：高秆易感病比例为l：l：l：l

  D.自交和测交后代出现四种相同表现型

  开始考试点击查看答案
• 6有关蛋白质合成的叙述，正确的是                        （    ）

  A.终止密码子不编码氨基酸

  B.每种tRNA可能运转多种氨基酸

  C.tRNA的反密码子携带遗传信息

  D.核糖体可在mRNA上移动

  开始考试点击查看答案
• 7筛选”是生物工程中常用的技术手段，下列关于筛选的叙述中错误的是

  A.单克隆抗体制备过程中，在完成细胞融合后，第一次筛选的目的是筛选出针对目标抗原的抗体为阳性的杂交瘤细胞

  B.单克隆抗体制备过程中，在完成细胞融合后，第一次筛选的目的是筛选出杂交瘤细胞

  C.基因工程中用不同种限制性核酸内切酶切割运载体和目的基因。

  D.重组质粒上的标记基因的作用是鉴别受体细胞中是否含有目的基因，从而将含有目的基因的细胞筛选出来。

  开始考试点击查看答案
• 8现象Ⅰ：小明的手指不小心碰到一个很烫的物品而将手缩回；现象Ⅱ：小明伸手拿别人的物品被口头拒绝而将手缩回。两个现象中的缩手反应比较见下表，正确的是<table style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; MARGIN: auto auto auto 32.4pt; BORDER-COLLAPSE: collapse; BORDER-TOP: medium none; BORDER-RIGHT: medium none; mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; 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="MsoTableGrid"><tbody><tr style="HEIGHT: 15.75pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt" width="60">选项</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 162pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="216">比较项目</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 99pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="132">现象Ⅰ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 87.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="117">现象Ⅱ</td></tr><tr style="HEIGHT: 15.75pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="60">A</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 162pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="216">反射弧的完整性</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 99pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="132">不完整</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 87.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="117">完整</td></tr><tr style="HEIGHT: 15.75pt; mso-yfti-irow: 2"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="60">B</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 162pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="216">是否需要大脑皮层参与</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 99pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="132">可以不要</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 87.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="117">一定需要</td></tr><tr style="HEIGHT: 15.75pt; mso-yfti-irow: 3"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="60">C</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 162pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="216">参与反射的神经元数量</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 99pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="132">少</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 87.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="117">多</td></tr><tr style="HEIGHT: 15.75pt; mso-yfti-irow: 4; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="60">D</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 162pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="216">缩手相关肌细胞数量</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 99pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="132">多</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 87.7pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; 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="117">少</td></tr></tbody></table>　

  B.

  C.

  开始考试点击查看答案