下列4种现象中，不适宜用生态系统中能量流动规律进行合理分析的是

试卷相关题目

• 1对性腺组织细胞进行荧光标记，等位基因A、a都被标记为黄色，等位基因B、b都被标记为绿色，在荧光显微镜下观察处于四分体时期的细胞。下列有关推测合理的是

  A.若这2对基因在1对同源染色体上，则有1个四分体中出现2个黄色、2个绿色荧光点

  B.若这2对基因在1对同源染色体上，则有1个四分体中出现4个黄色、4个绿色荧光点

  C.若这2对基因在2对同源染色体上，则有1个四分体中出现2个黄色、2个绿色荧光点

  D.若这2对基因在2对同源染色体上，则有1个四分体中出现4个黄色、4个绿色荧光点

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• 2细胞作为生命活动的基本单位，其结构和功能高度统一。下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进行物质交换，为胚胎早期发育提供所需养料②哺乳动物成熟的红细胞表面积与体积之比相对较大，有利于提高气体交换效率③小肠绒毛上皮细胞内有大量的线粒体，有助于物质运输的能量供应④哺乳动物成熟精子中细胞质较少，有利于精子运动

  A.①②③

  B.②③④

  C.①③④

  D.①②④

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• 3科学家从烟草花叶病毒(TMV)中分离出a、b两个不同品系，它们感染植物产生的病斑形态不同。下列4组实验(见下表)中，不可能出现的结果是 <table style="BORDER-COLLAPSE: collapse; MARGIN-LEFT: 6.75pt; MARGIN-RIGHT: 6.75pt; mso-table-layout-alt: fixed; mso-table-lspace: 9.0pt; mso-table-rspace: 9.0pt; mso-table-anchor-vertical: paragraph; mso-table-anchor-horizontal: margin; mso-table-left: left; mso-table-top: -.7pt; mso-padding-alt: 0cm 0cm 0cm 0cm" border="0" cellspacing="0" cellpadding="0" align="left" _dj="MsoNormalTable"><tbody><tr style="HEIGHT: 19.9pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes"><td style="BORDER-BOTTOM: medium none; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 29.05pt; PADDING-RIGHT: 0cm; HEIGHT: 19.9pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="39">实验</td><td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 291.95pt; PADDING-RIGHT: 0cm; HEIGHT: 19.9pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="389"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 95.8pt; PADDING-RIGHT: 0cm; HEIGHT: 19.9pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="128" colspan="2">实验结果</td></tr><tr style="HEIGHT: 27.05pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 29.05pt; PADDING-RIGHT: 0cm; HEIGHT: 27.05pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="39">编号</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 291.95pt; PADDING-RIGHT: 0cm; HEIGHT: 27.05pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="389">实验过程</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 26.6pt; PADDING-RIGHT: 0cm; HEIGHT: 27.05pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="35">病斑类型</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 69.2pt; PADDING-RIGHT: 0cm; HEIGHT: 27.05pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="92">病斑中分离出的病毒类型</td></tr><tr style="HEIGHT: 10.55pt; mso-yfti-irow: 2"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 29.05pt; PADDING-RIGHT: 0cm; HEIGHT: 10.55pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="39">①</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 291.95pt; PADDING-RIGHT: 0cm; HEIGHT: 10.55pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="389">a型TMV斗感染植物</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 26.6pt; PADDING-RIGHT: 0cm; HEIGHT: 10.55pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="35">a型</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 69.2pt; PADDING-RIGHT: 0cm; HEIGHT: 10.55pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="92">a型</td></tr><tr style="HEIGHT: 15.7pt; mso-yfti-irow: 3"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 29.05pt; PADDING-RIGHT: 0cm; HEIGHT: 15.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="39">②</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 291.95pt; PADDING-RIGHT: 0cm; HEIGHT: 15.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="389">b型TMV呻感染植物</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 26.6pt; PADDING-RIGHT: 0cm; HEIGHT: 15.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="35">b型</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 69.2pt; PADDING-RIGHT: 0cm; HEIGHT: 15.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="92">b型</td></tr><tr style="HEIGHT: 13.25pt; mso-yfti-irow: 4"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 29.05pt; PADDING-RIGHT: 0cm; HEIGHT: 13.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="39">③</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 291.95pt; PADDING-RIGHT: 0cm; HEIGHT: 13.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="389">组合病毒(a型TMV的蛋白质+b型TMV的RNA) 感染植物</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 26.6pt; PADDING-RIGHT: 0cm; HEIGHT: 13.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="35">b型</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 69.2pt; PADDING-RIGHT: 0cm; HEIGHT: 13.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="92">a型</td></tr><tr style="HEIGHT: 14.7pt; mso-yfti-irow: 5; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 29.05pt; PADDING-RIGHT: 0cm; HEIGHT: 14.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="39">④</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 291.95pt; PADDING-RIGHT: 0cm; HEIGHT: 14.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="389">组合病毒(b型TMV的蛋白质+a型TMV的RNA) 感染植物</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 26.6pt; PADDING-RIGHT: 0cm; HEIGHT: 14.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="35">a型</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 69.2pt; PADDING-RIGHT: 0cm; HEIGHT: 14.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="92">a型</td></tr></tbody></table>

  A.实验①

  B.实验②

  C.实验③

  D.实验④

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• 4已知A与a、B与b、C与C 3对等位基因自由组合，基因型分别为AaBbCc、AabbCc的两个体进行杂交。下列关于杂交后代的推测，正确的是

  A.表现型有8种，AaBbCc个体的比例为1／16

  B.表现型有4种，aaBbcc个体的比例为1／16

  C.表现型有8种，Aabbcc个体的比例为1／8

  D.表现型有8种，aaBbCc个体的比例为1／16

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• 5下列有关植物激素调节的叙述，正确的是①可利用适宜浓度的赤霉素促进细胞伸长，使植物增高②在植物组织培养中生长素和细胞分裂素的不同配比会影响组织分化③使同种植物的扦插枝条产生相同生根效果的2,4-D浓度相同④在太空失重状态下植物激素不能进行极性运输，根失去了向地生长的特性

  A.①②

  B.③④

  C.①③

  D.②④

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• 6下列关于人类遗传病的叙述，错误的是①一个家族仅一代人中出现过的疾病不是遗传病②一个家族几代人中都出现过的疾病是遗传病③携带遗传病基因的个体会患遗传病④不携带遗传病基因的个体不会患遗传病

  A.①②

  B.③④

  C.①②③

  D.①②③④

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• 7某小组进行“探究培养液中酵母菌种群数量的动态变化”实验时，同样实验条件下分别在4个试管中进行培养(见下表)，均获得了“s”型增长曲线。根据实验结果判断，下列说法错误的是 <table style="BORDER-COLLAPSE: collapse; MARGIN-LEFT: 0.75pt; mso-table-layout-alt: fixed; mso-padding-alt: 0cm 0cm 0cm 0cm" border="0" cellspacing="0" cellpadding="0" _dj="MsoNormalTable"><tbody><tr style="HEIGHT: 21pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 154.7pt; PADDING-RIGHT: 0cm; HEIGHT: 21pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="206">    试管号</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 21pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="60">    I</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 21pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="60">    Ⅱ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 21pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="60">    Ⅲ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.45pt; PADDING-RIGHT: 0cm; HEIGHT: 21pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" valign="top" width="61">    Ⅳ</td></tr><tr style="HEIGHT: 19.7pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 154.7pt; PADDING-RIGHT: 0cm; HEIGHT: 19.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="206">    培养液体积(mL)</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 19.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="60">    10</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 19.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="60">    5</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 19.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="60">    10</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.45pt; PADDING-RIGHT: 0cm; HEIGHT: 19.7pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="61">    5</td></tr><tr style="HEIGHT: 12.85pt; mso-yfti-irow: 2; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 154.7pt; PADDING-RIGHT: 0cm; HEIGHT: 12.85pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="206">  起始酵母菌数(103个)</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 12.85pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="60">    10</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 12.85pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="60">    5</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.1pt; PADDING-RIGHT: 0cm; HEIGHT: 12.85pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="60">    5</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; WIDTH: 45.45pt; PADDING-RIGHT: 0cm; HEIGHT: 12.85pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="61">    10</td></tr></tbody></table>

  A.4个试管内的种群初始阶段都经历了“J”型增长

  B.4个试管内的种群同时达到K值

  C.试管Ⅲ内种群的K值与试管Ⅱ不同

  D.试管Ⅳ内的种群数量先于试管Ⅱ开始下降

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• 8下列有关实验及显色结果的叙述，错误的有

  A.水浴加热条件下，蔗糖与斐林试剂发生作用生成砖红色沉淀

  B.沸水浴条件下，脱氧核苷酸与二苯胺发生作用呈现蓝色

  C.常温条件下，蛋白质与双缩脲试剂发生作用呈现紫色

  D.常温条件下，核糖核酸与甲基绿作用呈现绿色

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• 9加工橘子罐头，采用酸碱处理脱去中果皮(橘络)，会产生严重污染。目前使用酶解法去除橘络，可减少污染。下列生长在特定环境中的4类微生物，可以大量产生所用酶的有

  A.生长在麦麸上的黑曲霉

  B.生长在酸奶中的乳酸菌

  C.生长在棉籽壳上的平菇

  D.生长在木屑上的木霉

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• 10下列关于DNA和蛋白质提取与分离实验的叙述，正确的有

  A.提取细胞中的DNA和蛋白质都需用蒸馏水涨破细胞

  B.用不同浓度NaCl溶液反复溶解与析出DNA可去除蛋白质

  C.蛋白质提取和分离过程中进行透析可去除溶液中的DNA

  D.蛋白质和DNA都可以用电泳的方法进行分离纯化

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