0  294622  294630  294636  294640  294646  294648  294652  294658  294660  294666  294672  294676  294678  294682  294688  294690  294696  294700  294702  294706  294708  294712  294714  294716  294717  294718  294720  294721  294722  294724  294726  294730  294732  294736  294738  294742  294748  294750  294756  294760  294762  294766  294772  294778  294780  294786  294790  294792  294798  294802  294808  294816  447090 

7.某DNA分子中有脱氧核苷酸4000个,已知腺嘌呤和胸腺嘧啶之和占碱基总数的60%那么该DNA分子连续复制2次所需要的游离鸟嘌呤脱氧核苷酸分子数是(    ) 

A.800个     B.1 600个     C.2 400个     D.3 200个

试题详情

6.DNA分子的双链在复制时解旋,这时下述哪一对碱基从氢键连接处分开 (    )

A.腺嘌呤与胸腺嘧啶      B.鸟嘌呤与尿嘧啶 

C.鸟嘌呤与胸腺嘧啶      D.腺嘌呤与尿嘧啶

试题详情

5.构成烟草,噬菌体,烟草花叶病毒体内核酸物质的碱基种类依次是(    ) 

A.4  4  5     B.4  5  8     C.4  5  5      D.5  4  4

试题详情

4. 下列对一个四分体的描述不正确的是(    )

A.有两个着丝点  B.有四个DNA分子  C.有四个染色体   D.有两对姐妹染色单体

试题详情

3.下列关于基因的叙述中,错误的是(   ) 

A.基因中脱氧核苷酸的排列顺序代表着遗传信息

B.基因中所含的脱氧核苷酸共有四种

C.基因中所含脱氧核苷酸有成千上万个

D.基因在染色体上,DNA分子的片段叫做基因

试题详情

2.所有病毒的遗传物质(   ) 

A.都是DNA   B.都是RNA    C.是DNA或RNA   D.是DNA和RNA

试题详情

1.下列各组中不属于相对性状的是 (    )

A. 水稻的早熟和晚熟        B.豌豆的紫花和红花

C.小麦的抗病和易染病       D.绵羊的长毛和细毛

试题详情

第一节  单词拼写(共10小题,每小题1分,满分10分)

I单词填空

76. The sun has risen above the ____________(地平线).

77. Recently,we have seen a _____________(逐渐的) trend towards healthier food.

78. This new policy is much _________(强硬的) than the previous one.

79. I really __________(赞赏,喜欢) having time to relax with you on this nice island.

80. They are proud to be ________(公民,市民) of Jilin City.

81. The new highway _______(缠,绕) around the mountain.

82. The passengers were  __________(紧紧地) packed in the train.

83. Sharks can smell blood over a long ___________(距离).

84. The hostess had the _______________(邀请函) delivered a week before the party.

85.We should answer the questions on the ______(基础) of the information from the article.

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(^)。并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1 每处错误及其修改均仅限一词;

    2 只允许修改10处,多者(从第11处起)不记分。

If you understood another culture, it can help you with your language learning. This is because your background knowledge will make easier for you to understand the content of a reading passage. For example, if you have some knowledges about History and geography of Australia, it will make it easier for you to understand passages relating to Australia. In the same way, if you have watched the film The Mutiny on the Bounty you will know the background about the journey of Captain Bligh across the Pacific Ocean. So you will be more better able to appreciate what great Captain Bligh’s achievement was in second unit. But the more you read and the wider your generally knowledge about another culture is, the quicker and easier your learn of that language will be.

试题详情


同步练习册答案