问题 读图填空题

某科学家用含3H标记的氨基酸培养液培养甲细胞,并利用显微镜观察,回答下列问题:

(1)放射性最早出现在细胞器_____(填标号)中。在合成抗体的过程中产生了3H2O,H2O中的3H来自于氨基酸的___________(基团)。

(2)若甲图为口腔上皮细胞,想观察⑤结构,常用__________(染色剂名称)染色。

(3)如果用某种药物处理图甲所示的细胞,发现对K+的吸收速率大大降低,而对其它离子的吸收速率没有影响,说明这种药物的作用原理是___________。

A.削弱细胞吸收O2的能力   B.抑制或破坏了细胞膜上K+的载体

C.抑制了细胞内呼吸酶的活性   D.降低细胞中ATP的合成速率

(4)吸取一滴甲细胞培养液放在显微镜下观察,视野下观察到某一细胞如乙图所示,该细胞所处分裂时期的染色体行为变化是______________。该细胞在细胞周期中染色体数目最多为__________条。

(5)若甲图细胞发生癌变,癌变后的细胞容易分散和转移,这主要是由于结构①表面的________减少。

答案

(1)②    氨基和羧基

(2)健那绿

(3)B

(4)染色体的着丝点整齐排列在细胞中央赤道板平面   8

(5)糖蛋白   

阅读理解

阅读理解。

     The greatest saleswoman in the world today doesn't mind if you call her a girl (1) This is because Markita

Andrews made more than $ 80, 000 by selling cookies when she was 13 years old.

     Andrews and her mother shared a dream of travelling around the world. (2)Once, while reading magazines,

Andrews found that the person who sold the most cookies would win a free trip for two around the world.

She decided to have a try.

     To make her dream come true, Andrews went door to door every day after school and repeated, "Hi, I

have a dream. I'm earning a trip around the world for my mom and me by selling cookies." Then she asked,

"Would you like to buy one or two dozen boxes of cookies?"

     Andrews kept asking for a whole year, no matter how heavily it was raining or snowing outside. Her hard

work paid off. She sold 42, 000 boxes of cookies that year and she won her trip around the world.

     Andrews is no smarter than thousands of other people. The key to her success is that she has found the

secret of selling: Ask. Ask. Ask! Many people fail before they even begin because they fail to ask for what

they want.  

     It takes courage to ask for what you want. And, as Andrews has discovered, the more you ask, the easier

it gets.

1. 将(1)处改为同义句。

    This is because Markita Andrews made ________ $ 80, 000 by selling coolies 

    ________ ________ ________ ________ 13.

2. 将(2)处翻译成汉语。

    _________________________________________________________________

3. 根据文章内容,完成下面的句子。

    ________ is difficult, _________ you put your heart into it.

    Andrews' hard work makes her success.

推断题