11菠菜叶是一种常用的生物实验材料，但对一些实验来说则不适合。下列哪个实验适合采用菠菜作实验材料
A.检测生物组织中的还原性糖
B.细胞中脂肪的鉴定
C.观察植物细胞中的蛋白质
D.观察多种植物细胞的形态
开始考试练习点击查看答案12日常生活中把新宰杀的鱼或禽等马上煮熟了吃，肉老而口味不好；如果稍过一段时间再煮，肉反而鲜嫩。这可能与肌细胞内的哪种细胞器的作用和哪种物质含量增加有关
A.线粒体 氨基酸
B.核糖体 蛋白质
C.内质网 蛋白质
D.溶酶体 氨基酸
开始考试练习点击查看答案13通过特定方法，科学家将小鼠和人已分化的体细胞成功地转变成了类胚胎干细胞。有关分化的体细胞和类胚胎干细胞的描述，正确的是
A.类胚胎干细胞能够分化成多种细胞
B.分化的体细胞丢失了某些基因
C.二者功能有差异，但形态没有差异
D.二者基因组成相同，且表达的基因相同
开始考试练习点击查看答案14把鼠肝细胞磨碎后放入高速离心，细胞匀浆分成a、b、c、d四层，其中往c层加入葡萄糖，没有CO<sub>2</sub>和ATP产生；可是加入丙酮酸，马上就有CO<sub>2</sub>和ATP产生。C层必定含有的成分是①线粒体 ②核糖体 ③细胞质基质 ④ADP
A.①和④
B.②和④
C.①和③
D.②和③
开始考试练习点击查看答案15下列关于植物呼吸作用的叙述，正确的是
A.呼吸作用的中间产物丙酮酸可以通过线粒体双层膜
B.是否产生二氧化碳是有氧呼吸和无氧呼吸的主要区别
C.高等植物进行有氧呼吸，不能进行无氧呼吸
D.仓库中贮藏的风干种子不进行呼吸作用
开始考试练习点击查看答案16采用黑—白瓶（不透光—可透光瓶）法测定池塘群落各深度日代谢的平均氧浓度变化，结果如下表，请据表分析，该池塘一昼夜生产氧气和消耗氧气量各为多少g．m<sup>-2</sup><table style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; MARGIN: auto auto auto 52.65pt; WIDTH: 250.55pt; 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" border="1" cellspacing="0" cellpadding="0" width="334" _dj="MsoNormalTable"><tbody><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes; mso-height-rule: exactly"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 86.5pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly" valign="top" rowspan="2" width="115">深度</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 164pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt" valign="top" width="219" colspan="2">瓶中Ｏ2的变化（g．m-2）</td></tr><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 1; mso-height-rule: exactly"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 85.75pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="114">白瓶</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 78.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="104">黑瓶</td></tr><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 2; mso-height-rule: exactly"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 86.5pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-top-alt: solid windowtext .5pt" valign="top" width="115">1ｍ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 85.75pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="114">＋3</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 78.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="104">－1</td></tr><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 3; mso-height-rule: exactly"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 86.5pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-top-alt: solid windowtext .5pt" valign="top" width="115">2ｍ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 85.75pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="114">＋2</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 78.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="104">－1</td></tr><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 4; mso-height-rule: exactly"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 86.5pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-top-alt: solid windowtext .5pt" valign="top" width="115">3ｍ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 85.75pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="114">0</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 78.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="104">－1</td></tr><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 5; mso-height-rule: exactly"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 86.5pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-top-alt: solid windowtext .5pt" valign="top" width="115">4ｍ</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 85.75pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="114">－1</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 78.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="104">－1</td></tr><tr style="HEIGHT: 14.2pt; mso-yfti-irow: 6; mso-height-rule: exactly; 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: 86.5pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-top-alt: solid windowtext .5pt" valign="top" width="115">水底</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 85.75pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="114">－3</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 78.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.2pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-height-rule: exactly; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="104">－3</td></tr></tbody></table>
A.5；7
B.8；7
C.8；11
D.5；11
开始考试练习点击查看答案17将状况相同的某种绿叶分成面积相等的四组，在不同温度下分别暗处理1h，再光照1h（光强相同），测其重量变化，得到如下表的数据。可以得出的结论是<table border="1" cellspacing="0" cellpadding="0" _dj="MsoNormalTable"><tbody><tr><td width="224">组别</td><td width="72">一</td><td width="72">二</td><td width="72">三</td><td width="72">四</td></tr><tr><td width="224">温度/℃</td><td width="72">27</td><td width="72">28</td><td width="72">29</td><td width="72">30</td></tr><tr><td width="224">暗处理后重量变化/mg</td><td width="72">-1</td><td width="72">-2</td><td width="72">-3</td><td width="72">-1</td></tr><tr><td width="224">光照后与暗处理前重量变化/mg</td><td width="72">+3</td><td width="72">+3</td><td width="72">+3</td><td width="72">+1</td></tr></tbody></table>
A.该植物光合作用的最适温度约是27℃
B.该植物呼吸作用的最适温度约是29℃
C.27～29℃下的净光合速率相等
D.30℃下的真正光合速率为2mg/h
开始考试练习点击查看答案18肿瘤是21世纪人类最主要的杀手，它是一种由环境因素与遗传因素相互作用的复杂性疾病，下列有关癌细胞的叙述不正确的是
A.癌变的内在因素是致癌因子激活原癌基因
B.减少癌细胞的营养供应可以抑制癌细胞的增殖
C.所有癌细胞中DNA含量都相同
D.用化学药剂抑制肿瘤细胞的DNA复制，使其停留在间期
开始考试练习点击查看答案19若果蝇细胞正常进行细胞分裂，其一个核内染色体数、DNA分子数、染色体组数、染色单体数之比为8 ：8 ：2 ：0时，则该细胞处于
A.有丝分裂前期
B.有丝分裂中期
C.有丝分裂后期
D.有丝分裂末期
开始考试练习点击查看答案20一个初级精母细胞在减数分裂的第一次分裂时，有一对同源染色体不发生分离；所形成的次级精母细胞的第二次分裂正常。另一个初级精母细胞减数分裂的第一次分裂正常，减数第二次分裂时，在两个次级精母细胞中，有一个次级精母细胞的1条染色体的姐妹染色单体没有分开。以上两个初级精母细胞可产生染色体数目不正常的配子（以下简称不正常配子）。上述两个初级精母细胞减数分裂的最终结果应当是
A.两者产生的配子全部都不正常
B.两者都只产生一半不正常的配子
C.前者产生一半不正常的配子，后者产生的配子都不正常
D.前者产生的配子都不正常，后者产生一半不正常的配子
开始考试练习点击查看答案