题干

下列关于细胞核的结构和功能的叙述,不正确的是(  )

A:克隆羊多利的诞生证明了动物细胞具有全能性

B:除了极少数细胞外,真核细胞都有细胞核

C:大分子物质通过核孔进入细胞质而不能直接通过核膜,体现了核膜具有选择透过性

D:细胞核是遗传信息库,是细胞代谢和遗传的控制中心

上一题 下一题 0.0难度 选择题 更新时间:2018-12-31 10:09:38

答案(点此获取答案解析)

A

同类题2

任务型阅读

    A new report says plastics are responsible for $13 billion in damage to the oceans and the undersea environment. The findings were announced recently at a United Nations conference. ____.

    Plastic thrown away carelessly makes its way into rivers and other waterways.____ After a while, it collects in the sea. And plastic never goes away. Plastic is not biodegradable—destroyed by bacteria or natural processes. Instead, it just breaks up into smaller pieces over time. The oceans contain a lot of chemicals and other pollutants(污染物). ____. That means harmful material may get into our food supply.

    ____. Human beings cause pollution and they can take steps to stop it. They can use fewer single use product containers and throw plastics away correctly. Plastic recycling programs also works—where old bottles and other plastics are collected, broken down and used to make new products. We could reuse bottles in our households many times if we wish to, rather than end it after the first use. We could, when we get rid of that plastic, recycle it and reuse it, which replaces the need for raw materials.

    The report also calls on companies to improve methods for using plastics. ____. And it calls for information about the way plastic is thrown out or removed from use. By putting a new value on plastic, industry has a special reason to clean up the environment. But all of the companies must join to deal with the problem.

A. Then, fish may eat the plastics.

B. But people can make a big difference.

C. Plastics should be gathered together and reused.

D. It is convenient to use plastic bags in everyday life.

E. It asks for them to better measure and control plastic use.

F. The plastic eventually reaches coastal areas and ocean waters.

G. The report tells about harm to sea life and what might be done to improve the situation.

同类题5

阅读材料,回答问题

材料一:图为两次工业革命的工业成果

材料二:大洋洲有我们的牧羊场,阿根廷和北美西部草原上有我们的牛群,秘鲁送来它的白银,南非和澳大利亚的黄金流向伦敦,印度人和中国人为我们种茶,而且我们的咖啡、白糖和香料种植园遍布东印度群岛……

——19世纪中期一位英国经济学家的记述

材料三:1851年伦敦举办第一届世界工业产品博览会。在博览会期间,最受参观者瞩目的展品是蒸汽机、水力印刷机、纺织机械等技术型产品。1878年的巴黎世界博览会令人目不暇给,有52835项展示品,其中令举世惊奇的是:贝尔的电话、爱迪生的留声机、冷冻船等。1900年法国巴黎世博会上,法国吕米埃兄弟制作的电影在全世界面前展示,成为了最受瞩目的焦点之一。

材料四:1851年,伦敦世博会上,上海英商“宝顺洋行”买办徐荣村携自己经营的“荣记湖丝”以私人身份参加了伦敦世博会,获金银大奖。1876年美国费城举办的世博会,这是第一次真正由中国代表参加的世界博览会,中国馆的展品是丝、茶、瓷器、绸货、雕花器、景泰器等。1904年美国圣路易斯举办的世博会上,中国馆的展品仍是中国传统的农产品、手工业品和工艺品,汇聚了各种各样富有中华特色的游艺戏院、一间佛殿、一间茶室、一个东方美食园。

——以上材料均摘编自《中国与世博:历史记录(1851-1940)》

材料五:世博会自诞生之日起就在为近现代工业化服务。19世纪中叶以来人类最伟大的发明几乎都在世博会上出现过。如果没有世博会,爱迪生的发明也许不能迅速得到普及;如果没有世博会,电话机与电报机也许不能很快受到青睐;如果没有世博会,拉链、魔方和萨克斯也许不能如此风靡世界。