下列对甲、乙、丙三个与DNA分子有关的图的说法,正确的是:() A.甲图DNA放在含

题型:单项选择题

问题:

下列对甲、乙、丙三个与DNA分子有关的图的说法,正确的是:()

A.甲图DNA放在含15N培养液中复制2代,子代含15N的DNA单链占总链的1/8,限制性内切酶可作用于①部位,解旋酶作用于③部位

B.甲图②处的碱基对缺失将导致基因突变,乙图中表示逆转录,图中显示有7种核苷酸

C.丙图中所示的生理过程为转录和翻译,甲图中(A+C./(T+G)比例能表现DNA分子的特异性

D.丙图所示的过程可发生在细菌中,根尖细胞中能进行乙图所示生理过程的结构有细胞核、线粒体

考点:高中生物DNA的结构与复制DNA的结构与复制题库
题型:单项选择题

阅读理解。

     Children are amazing! They ①pick up languages so naturally and easily. Have you ever wondered why?

It's not because they have great natural language abilities. ② In fact, studies show that an adult's potential (潜

能) to learn language is as good as a child's.

     So why do children still seem to acquire (学到) languages more quickly than the rest of us? It's because

of the way they learn. Children learn by simply doing what comes naturally-they listen, copy and communicate.

Let's take a closer look at how children acquire languages. Perhaps we can discover a better, more "natural"

way to learn English.

     Children don't practice grammar drills, but use languages to talk about things that interest them. This helps

them learn to express themselves. They don't worry about inadequate (不足的) vocabulary or poor grammar.

They find ways to express themselves, and they do it successfully.

     ③Students should pay more attention to genuine (真实的) communication. Look for chances to talk with

people in English. If you can't find a foreigner to talk to, talk with other English students instead. Start an

English discussion group and chat about music, movies or whatever interests you.

     Don't worry about making mistakes. The aim is to learn how to communicate easily and comfortably.

Remember that you can communicate successfully even with a small vocabulary.

     Trust your own natural ability to learn English. You've got more potential than you probably realize!

1. 在文中找出①处划线短语的同义词。

     ______________________________________________________

2. 将文中②处划线句子翻译成汉语。

     ______________________________________________________ 

3. Do children worry about poor grammar when they learn to express themselves? 

     ______________________________________________________

4. 将文中③处划线句子改为被动语态。

   Genuine communication should ______  ______ more attention to by students.

5. As a student, how should you learn language by reading the passage? 

    ______________________________________________________

题型:单项选择题

胸部损伤后的血液是不凝固的,其不凝固的原因是()

A.弥散性血管内凝血

B.肺、心和膈肌的去纤维蛋白作用

C.凝血酶原减少

D.血小板减少

E.多种凝血因子减少

题型:单项选择题

年薪制适用对象的特点包括()。

A.素质较高

B.比其他职位更需要激励

C.工作过程需要严格的管控

D.工作价值难以在短期体现

E.工作过程需要较高创造力

题型:单项选择题

普通毛圈、移圈织物、衬纬经编组织分类?

题型:单项选择题

俄国批判现实主义的奠基作是()。

A、《叶甫盖尼•奥涅金》

B、《当代英雄》

C、《死魂灵》

D、《驿站长》

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