题干

下列有关细胞分裂和细胞分化的叙述,错误的是( )

A:细胞分裂产生新细胞的形态结构与原细胞的相似

B:细胞分裂产生新细胞的染色体数目不变

C:细胞分化可以形成不同的组织

D:细胞分化可以导致细胞中的遗传物质发生改变

上一题 下一题 0.0难度 选择题 更新时间:2019-10-22 11:09:20

答案(点此获取答案解析)

D

同类题1

阅读下列材料,回答问题。

材料一:香港的水坑口街(原名叫“波些臣街”“占领街”)……这标志着中国半殖民地半封建社会的开始,也是血泪斑斑的中国近代史的开始。那片美丽的香港海湾被冠以维多利亚女王的名字,以纪念英国对一个古老文明的胜利。                                             ——《复兴之路》解说词

材料二:昨日下午,法国皮诺家族在国家博物馆将圆明园流失文物青铜鼠首和兔首无偿捐赠给中国,这是圆明园被劫掠文物首次以无偿捐赠的方式回归。国家文物局已将这两尊兽首划拨国家博物馆收藏,并将于近期公开展出。至此,圆明园12兽首中已有7件回归。

——《新京报》2013年6月29日

材料三:清国之败,非君相一己之罪,盖其墨守常经,不变通所致也。夫取士必考试,考试必由文艺,文艺乃为显荣之阶梯,岂足济实效乎? ……前三十载,我日本之国事,遭若何等之辛酸,厥能免于垂危者,度阁下之所深悉也。当此之时,我国去旧治,因时制宜,更张新政,为国可存立之一大要图。……——摘自1895年《大日本海军总司令官伊东佑亨致大清国北洋水师提督丁汝昌书》

材料四:结果京师再陷,朝廷狼狈出亡,东北初步全部沦陷,被据五年,结果赔偿巨款,京津一带驻兵,形同异域,满清政府完全在外人宰制之下,中国已失去独立的精神。

——郭廷以《近代中国的变局》请回答:

同类题5

阅读理解

    Internet Security Awareness

    MS-ISAC

    “Kids Safe Online”

    2017 Virginia Poster Contest(比赛)

    Official Rules

    Contestants

    The contest is open to all Virginia public, private Kindergarteners -12 in the United States, District of Columbia and the U.S. Territories (领土).

    Judging Criteria

    Posters will be judged on the following criteria:

    Clear message conveyed by the text and artwork

    Creativity, originality and artistic quality

    Visual clarity - easily read

    Bright and colorful

    Must not use published materials.

    Winners

    Virginia will select the top 5 winning posters from each grade group (K-5, 6-8, 9-12) and send them to the National Multi-State Information Sharing and Analysis Center (MS-ISAC) Internet Security Awareness Poster Contest. The Virginia winners will receive a certificate of appreciation. MS- ISAC will select four winners in each grade and award a prize. These winners will have the honor of having their artwork made into a poster calendar which will be handed out throughout the country and may also be used in campaigns to raise awareness among children of all ages about the Internet.

    Posters will not be returned!

    Deadline

    All posters must be received by midnight, Jan. 6, 2017.

    Poster should be mailed to:

    Kids Safe Online Poster Contest Virginia Information Technology Agency Commonwealth Security & Risk Management

    11751 Meadowville Lane Chester, VA 23836

    Electronic posters can be sent to: CommonwealthSecurity@virginia.gov

    Contest Timeline

    Now through Jan. 6, 2017

    Students create their posters and the school can choose up to 15 posters to send to VITA by midnight January 6, 2017.

    No Later than Jan. 27, 2017

    Virginia posters will be judged and the top 15 posters will be sent to MS-ISAC for national judging.

    Jan. 30 to March 3, 2017,

    MS-ISAC will perform national judging. Winners will be declared no later than March 24, 2017