1下列关于细胞内化合物的叙述，正确的是
A.ATP脱去2个磷酸基团后是RNA的基本组成单位之一
B.糖原代谢的最终产物是葡萄糖
C.蔗糖和乳糖水解的产物都是葡萄糖
D.脂肪和生长激素是生物体内的能源物质
开始考试练习点击查看答案2下列有关神经兴奋的叙述，正确的是
A.静息状态时神经元的细胞膜内外没有离子进出
B.组织液中Na+浓度增大，则神经元的静息电位减小
C.突触间隙中的神经递质经主动运输穿过突触后膜而传递兴奋
D.神经纤维接受刺激产生的兴奋以电信号的形式传导
开始考试练习点击查看答案3下列关于固定化酶和固定化细胞的叙述，正确的是
A.固定化细胞技术在多步连续催化反应方面优势明显
B.固定化酶的应用中，要控制好pH、温度和溶解氧
C.利用固定化酶降解水体中有机磷农药，需提供适宜的营养条件
D.利用固定化酵母细胞进行发酵，糖类的作用只是作为反应底物
开始考试练习点击查看答案4下列有关细胞生命活动的叙述，正确的是
A.分裂期的细胞不进行DNA复制和蛋白质合成
B.免疫系统中的记忆细胞既有分化潜能又有自我更新能力
C.凋亡细胞内的基因表达都下降，酶活性减弱
D.原癌基因突变促使细胞癌变，抑癌基因突变抑制细胞癌变
开始考试练习点击查看答案5下列有关孟德尔豌豆杂交实验的叙述，正确的是
A.孟德尔在豌豆开花时进行去雄和授粉，实现亲本的杂交
B.孟德尔研究豌豆花的构造，但元需考虑雌蕊、雄蕊的发育程度
C.孟德尔根据亲本中不同个体表现型来判断亲本是否纯合
D.孟德尔利用了豌豆白花传粉、闭花受粉的特性
开始考试练习点击查看答案6下列关于哺乳动物胚胎发育和胚胎工程的叙述，正确的是
A.卵裂期胚胎中细胞数目和有机物总量在不断增加
B.胚胎分割时需将原肠胚的内细胞团均等分割
C.胚胎干细胞具有细胞核大、核仁小和蛋白质合成旺盛等特点
D.胚胎干细胞是一类未分化细胞，可从早期胚胎中分离获取
开始考试练习点击查看答案7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
开始考试练习点击查看答案8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
开始考试练习点击查看答案9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
开始考试练习点击查看答案10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
开始考试练习点击查看答案