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整合素如何参与信号转导？

答案

参考答案：

（1）整联蛋白的结构、功能。（2）信号传递功能依赖于细胞内的FAK，黏着斑激酶。（3）FAK的活化又依赖于整联蛋白与胞外基质配体结合形成黏着斑。（4）整联蛋白与其他细胞表面受体通过多种协同方式刺激细胞产生应答，调节细胞生长、生存和凋亡。

单项选择题

A common assumption about the private sector of education is that it caters only to the elite. (31) recent research points in the opposite direction. If we want to help some of most (32) group in society, then encouraging deeper private sector (33) is likely to be the best way forward.
Several developments are (34) in India, all of which involve the private education sector meeting the (35) of the poor in distinct ways. (36) India is not unique in this respect—similar phenomena are happening all over the developing world.
As a point of departure, how do government schools serve the poor Usefully, the government sponsored Public Report on Basic Education in India from 1999 paints a very (37) picture of the" (38) "of the government schools for the poor. When researchers (39) unannounced on their random sample of the schools, only 53% had any "teaching activity" going on. (40) , the team not- ed that the (41) of teaching standards has nothing to do (42) disempowered teachers, but instead could be (43) "plain negligence". They noted "several cases of irresponsible teachers (44) a school closed for months at a time".
But is there any (45) to these schools Sorely no one else can do better than government (46) the resources available As it happens, the Report pointed to private schools that were serving the poor and (47) that such problems were not found in these schools. Most parents believed that private schools were successful because they were more accountable: "the teachers are account- able to the manager who can fire them, and, (48) him or her, to the (49) who can withdraw their children." Such accountability was not present in the government schools, and "this contrast is (50) with crystal clarity by vast majority of parents.\

A．desolate

B．bleak

C．ingenious

D．delicate
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多项选择题

对西红柿需求的变化，可能是由于（）。

A.消费者认为西红柿价格太高了

B.消费者得知西红柿有益健康

C.消费者预期西红柿将降价

D.种植西红柿的技术有了改进

E.其他蔬菜价格上涨
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