问题 名词解释

troponin,Tn (肌钙蛋白)

答案

参考答案:

肌钙蛋白由3个多肽,即肌钙蛋白T(Tn-T)、肌钙蛋白I(Tn-I)、肌钙蛋白C(Tn-C)组成的复合物。Tn-T(MW37,000)是一种长形的纤维状分子,长度大约是肌钙蛋白的三分之一,Tn-I和Tn-C都是球形分子。Tn-I(MW22,000)能够同肌动蛋白以及Tn-T结合,它与肌动蛋白的结合就抑制了肌球蛋白与肌动蛋白的结合。Tn-C(MW18,000)是肌钙蛋白的Ca2+结合亚基,在序列上同钙调蛋白以及肌球蛋白的轻链相类似,Tn-C控制着原肌球蛋白在肌动蛋白纤维表面的位置。在细肌丝上大约每隔40nm就结合有一个肌钙蛋白。

阅读理解

阅读理解。

    

     It was an exciting moment for Shen Xue and Zhao Hongbo, a retired married couple from Harbin, China.

It was also a great moment for China because it was the country's first gold medal in the pairs figure (花样)

skating competition at the 2010 Vancouver Winter Olympic Games.

     Everyone was very quiet when Shen and Zhao were skating onto the ice. They were expecting something

wonderful to happen. As soon as the music started, Shen and Zhao skated around the field quickly with

beautiful style; every move was perfect. When the music stopped, all the people cheered. In the end Shen

and Zhao won the Olympic gold medal.

     In China, winter sports are not as popular as they are in America and Northern European countries. So

China sent only 90 athletes to Vancouver to take in a few, carefully chosen sports. Such a good decision also

led to Wang Meng and Zhao Yang winning gold medals in the little known, but exciting sports of short track

(轨道) speed skating.

     China did not win a lot of medals at these Winter Games. Most of the events are still very new to China

and need to be developed. But Chinese athletes learn very quickly. For example, China's women's curling team (冰壶队) only began in 2003, but they were No. 1 at the 2009 World Women's Curling Championship.

     This means that with hard work and a bit of luck, China's winter stars could soon shine on the world

stage.

1. Shen Xue won the gold medal in the ________ event at the 2010 Vancouver Olympics.

A. pairs of figure skating

B. short track speed skating

C. women's curling

D. long track speed skating

2. The people were ________ when Shen Xue and Zhao Hongbo started skating at the games.

A. noisy

B. quiet

C. cheering

D. excited

3. The underlined (画线) word "couple" means ________ in Chinese.

A. 对手

B. 朋友

C. 夫妻

D. 同事

4. China's women's curling team won't be eight years old until ________.

A. 2003

B. 2009

C. 2010

D. 2011

5. What made China's winter athletes get such a success?

A. Luck.

B. A chance.

C. Hard work and a little luck.

D. The country's support.

单项选择题 A3/A4型题