您所在的当前位置：高中生物试题 >

细胞的生长和增殖的周期性

> 下列有关细胞的叙述，正确的是 [ ] A．病毒是一类具有细胞结构的生物 B．蓝藻细胞具有细胞核且DNA分子呈环状 C．人体所有细胞的细胞周期持续时间相同 D．内质网膜和高尔基体膜都具有流动性

问题：

发布时间：2024-09-09

下列有关细胞的叙述，正确的是
[ ]
A．病毒是一类具有细胞结构的生物
B．蓝藻细胞具有细胞核且DNA分子呈环状
C．人体所有细胞的细胞周期持续时间相同
D．内质网膜和高尔基体膜都具有流动性

参考答案：

提问用户：tI***kxz

可能感兴趣的题目：

1 在25℃时，某氯化铵溶液的pH=4，下列说法中不正确的是（　　） A．溶液中c（H+）＞c（OH-），且Kw=c（H+）．c（OH-）=1×10-14mol2/L2 B．由水电离出来的H+浓度为1×10-14mol/L-1 C．溶液中c（Cl-）＞c（NH4+）＞c（H+）＞c（OH-） D．此溶液中由水电离出来的c（H+）=c（OH-）
2 小明同学计划今年暑假去法、德、意等欧洲国家游历，为了旅行方便，他去银行兑换的货币最好是 A．日元 B．欧元 C．法郎 D．马克
3 S l和S 2表示劲度系数分别为k l和k 2的两根弹簧，k 1＞k 2；a和b表示质量分别为m a和m b的两个小物块，m a＞m b．将弹簧与物块按图示方式悬挂起来。现要求两根弹簧的总长度最大，则应使（） A．S1在上，a在上 B．S1在上，b在上 C．S2在上，a在上 D．S2在上，b在上
4 下列命题中是真命题的为（　　） A．函数y=2sin2x的图象向右平移 π 6 个单位后得到函数y=2sin(2x- π 6 )的图象 B．函数f（x）=xcos2x在区间[0，2π]上的零点个数为5 C．函数y=log 1 2 (x2-5x+6)的单调递增区间为(-∞， 5 2 )． D．命题“若α= π 4 ，则tanα=1”的逆否命题是：若α= π 4 ，则tanα≠1
5 (2013·山东高考)—How far can you run without stopping? —________. I"ve never tried. A．Don"t mention it B．That"s all right C．I have no idea D．Go ahead
6 31 st October —— A team of British explorers has announced they are going to the North Pole to measure the ice cap’s thickness. The exploration will take ground-based readings (仪表的读数) of an ice formation which most scientists agree is shrinking at an alarming rate. Explorer Pen Hadow’s three-member team will pull a sled-fixed radar device, which measures ice density every eight centimeters, 2,000 kilometers across the Arctic and will produce millions of readings. They will leave in February, 2008 and will face temperatures of -50℃ on a journey that will take up to 120 days. They have been testing their equipment in Britain and Canada. Hadow is excited about the prospects (前景), “For the first time we will be able to transmit video images — webcam film of the expedition — as it unfolds so people can track us, and the whole idea is to engage as many people as we can in what we’re doing.” New fallen snow on top of the ice makes ground-based measurements more accurate than satellite data. “It has been in the planning stage for a while,” said Hadow. “We spent the last two years developing impulse radar (冲击雷达), which normally is about 100 kilograms and hangs under an aircraft and so on. We’ve managed to get it down to about 4 kilograms. It’s the size of a briefcase and we are dragging it behind the sled as we go.” 　　　　The ice cap shrank enough in 2007 so that a pathway through the cap known as the Northwest Passage opened up during the melting of the Arctic summer. Cambridge University’s Joao Rodrigues explains, “Thickness of the ice cap will determine how much solar radiation will be reflected and the heat exchange between the ocean and the atmosphere and it is thus a vital component (成分) of climate models.” If warming trends continue, some experts predict that the Arctic Ocean could be ice-free during the summer within a few decades. １ What would be the best title for the text? A. Exploration to the North Pole. B. Arctic ice cap shrinking. C. Arctic ice survey announced. D. Ground-based measurements of ice. ２. What is special about the exploration? A. It will be broadcast live on the Internet. B. Explorers will use a sled-fixed radar device. C. Explorers will travel in extremely cold conditions. D. Ground-based measurements are more accurate. ３. What is the purpose of the exploration? A. To measure the ice cap’s thickness. B. To study whether ice will disappear in the Arctic. C. To make a film about the Arctic exploration. D. To make people interested in what they are doing. ４. It can be inferred from the passage that ________. A. ice in the Arctic will disappear in ten years B. the exploration will last for half a year C. Hadow spent two years developing a kind of radar, which is about 100 kilograms D. if there is snow on ice, satellites can’t measure the ice thickness accurately enough ５. From the passage, we learn that ________. A. the explorers will measure ice density every other centimeter B. people will be able to follow the explorers and see what they are doing C. people could go through the Northwest Passage in the 2007 Arctic summer D. the equipment that Hadow’s team use will be tested in the United States
7 不能用排水法收集的气体是（　　） A．NO B．N02 C．CO D．N2
8 奥运会、残奥会的成功举办，弘扬了团结、友谊、和平的奥林匹克精神，促进了世界人民的相互了解和友谊，让“同一个世界，同一个梦想”的口号响彻寰宇。其政治意义是 ①增强了中华民族的民族凝聚力，有利于构建社会主义和谐社会 ②展示了我国的综合国力，提高了我国的国际地位 ③促进了我国对外交流与合作，为我国创造了良好的国际环境 ④有利于建设持久和平、共同繁荣的和谐世界 A．①②③ B．①③④ C．①②④ D．①②③④
9 党中央指出：在面临强权政治、霸权主义挑战的情况下，要始终注意教育广大干部群众把国家主权和安全放在第一位，自觉维护国家的统一、民族团结和人民的根本利益。“国家意识”的淡薄不利于我们民族整体的发展，要把我们自己的事情办好，“国家意识”不得不强化。作为公民，强化“国家意识”就应该… （） ①当个人利益和国家利益发生矛盾时，个人利益服从国家利益 ②只对国家履行义务不应强调自身权利 ③坚持个人利益与国家利益相结合的原则 ④维护国家安全、荣誉和利益 A．①②③ B．②③④ C．①③④ D．①②④
10 ___________get to the company in time, we set out early in the morning. [ ] A. So as to B. In order to C. So that D. In order that