当某植物顶芽比侧芽生长快时会产生顶端优势， 其主要原因是

试卷相关题目

• 1有关动物细胞有丝分裂的叙述，正确的是

  A.细胞板在细胞有丝分裂末期形成

  B.同源染色体配对通常发生在分裂前期

  C.在分裂末期，细胞膜内陷形成两个子细胞

  D.在分裂中期，两个中心粒复制形成两组中心粒

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• 2下列关于叶绿体的描述，错误的是

  A.基粒由类囊体堆叠而成

  B.叶绿体被膜由双层膜组成

  C.暗反应发生在类囊体膜上

  D.类囊体膜上具有叶绿素和酶

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• 3下列关于糖的叙述，正确的是

  A.葡萄糖和果糖分子均有还原性

  B.葡萄糖和麦芽糖可被水解

  C.构成纤维素的单体是葡萄糖和果糖

  D.乳糖可以被小肠上皮细胞直接吸收

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• 4下列叙述，错误的是

  A.血液中甲状腺激素增加时会促进垂体分泌促甲状腺激素

  B.血浆渗透压的大小主要取决于血浆中无机盐和蛋白质的含量

  C.内分泌腺分泌的激素释放到内环境中，然后作用于靶细胞

  D.淋巴中的淋巴细胞可以通过淋巴循环由锁骨下静脉汇入血液

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• 5成年大鼠血液中甲状腺激素浓度升高时，可能出现

  A.体温升高、耗氧量减少

  B.体温下降、耗氧量增加

  C.神经系统兴奋性提高、耗氧量增加

  D.神经系统兴奋性提高、体温下降

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• 6下列关于遗传信息传递的叙述，错误的是

  A.线粒体和叶绿体中遗传信息的传递遵循中心法则

  B.DNA中的遗传信息是通过转录传递给mRNA的

  C.DNA中的遗传信息可决定蛋白质中氨基酸的排列顺序

  D.DNA病毒中没有RNA，其遗传信息的传递不遵循中心法则

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• 7某同学分离纯化了甲、乙两种噬菌体的蛋白质和DNA，重新组合为“杂合”噬菌体，然后分别感染大肠杆菌，并对子代噬菌体的表现型作出预测，见表。其中预测正确的是 <table style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; BORDER-COLLAPSE: collapse; MARGIN-LEFT: 34.05pt; 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="MsoNormalTable"><tbody><tr style="HEIGHT: 14.55pt; 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: 115.85pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt" rowspan="2" width="154">“杂合”噬菌体的组成</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 231.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; 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="309" colspan="2">实验预期结果</td></tr><tr style="HEIGHT: 6.8pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.8pt; BORDER-TOP: medium none; 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="155">预期结果序号</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.8pt; BORDER-TOP: medium none; 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="155">子代表现型</td></tr><tr style="HEIGHT: 14.55pt; mso-yfti-irow: 2"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.85pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="2" width="154">甲的DNA＋乙的蛋白质</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: medium none; 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="155">1</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: medium none; 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="155">与甲种一致</td></tr><tr style="HEIGHT: 6.8pt; mso-yfti-irow: 3"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.8pt; BORDER-TOP: medium none; 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="155">2</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.8pt; BORDER-TOP: medium none; 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="155">与乙种一致</td></tr><tr style="HEIGHT: 14.55pt; mso-yfti-irow: 4"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.85pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" rowspan="2" width="154">乙的DNA＋甲的蛋白质</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: medium none; 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="155">3</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.55pt; BORDER-TOP: medium none; 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="155">与甲种一致</td></tr><tr style="HEIGHT: 6.8pt; mso-yfti-irow: 5; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.8pt; BORDER-TOP: medium none; 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="155">4</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 115.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.8pt; BORDER-TOP: medium none; 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="155">与乙种一致</td></tr></tbody></table>

  A.1、3

  B.1、4

  C.2、3

  D.2、4

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• 8下列叙述中，不能说明“核基因和染色体行为存在平行关系”的是

  A.基因发生突变而染色体没有发生变化

  B.非等位基因随非同源染色体的自由组合而组合

  C.二倍体生物形成配子时基因和染色体数目均减半

  D.Aa杂合体发生染色体缺失后，可表现出a基因的性状

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