某DNA分子的A+T含量为90%,其Tm值为()。A.93.2摄氏度 B.73.4摄

题型:单项选择题

问题:

某DNA分子的A+T含量为90%,其Tm值为()。

A.93.2摄氏度

B.73.4摄氏度

C.106.2摄氏度

D.89.8摄氏度

E.以上都不对

考点:化学工程生物化学生物化学题库
题型:单项选择题

阅读理解。

     Having Fun "Growing" and "Stealing"? Recently, an Internet game has become a new fashion among

young office workers and students. People can "farm" on a piece of "land" and "grow", "sell" or even "steal"

"vegetables", "flowers", and "fruits" on the Net. They can earn some e-money and buy more "seeds", "pets",

and even "houses". Joyce interviewed some young people. Here are their opinions.

Harold: I don't quite understand why they are mad about the childish game. Maybe they are just not confident

            enough to face the real world.

Allan: I enjoy putting some "bugs" in my friends' gardens and we've become closer because of the game. 

          Having fun together is the most exciting thing about it.

Laura: You know, people in the city are longing for (渴望) the life in the countryside. It reduces my work

            pressure (压力); Besides, it gives me the exciting experience of being a "thief".

Ivy: Well, it's just a waste of time. Teenagers playing the game spend so many hours on it that they can not

       focus on (专注于) their study.

1. According to the passage, people can't ______ things in this game. [ ]

A. grow

B. borrow

C. steal

D. sell

2. Among the people Joyce interviewed, ______ likes the game while ______ dislikes the game. [ ]

A. Laura; Allan

B. Allan; Harold

C. Harold; Ivy

D. Ivy; Allan

3. From Laura's words, we can guess that she is most probably ______. [ ]

A. a student

B. an office worker

C. a farmer

D. a thief

4. Which is NOT the reason why people like the game? [ ]

A. They are longing for country life.

B. They can have fun with friends.

C. The game can relax people and give them a new experience.

D. They are confident enough to face the real world.

5. Where can you find this passage? [ ]

A. In a car magazine.

B. In an advertisement.

C. In a newspaper.

D. In a science book.

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在血站质量控制时,为确定血液的有效性,需要检测纤维蛋白原含量的血液品种有()

A.冷沉淀凝血因子

B.冰冻血浆

C.病毒灭活新鲜冰冻血浆

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