题目

有关蛋白质分子的叙述，正确的是（ ）A. 细胞内蛋白质发生水解时常常需要另一种蛋白质的参与B. 氨基酸的空间结构和种类的多样性决定了蛋白质功能的多样性C. 高温能使蛋白质分子肽键断裂、空间结构发生改变而变性失活D. 组成蛋白质的氨基酸之间可以通过不同的方式脱水缩合 答案：【答案】A【解析】细胞内蛋白质水解常常需要蛋白酶（另一种蛋白质）催化才能水解，A正确；氨基酸的种类、数量和排列顺序的多样性以及肽链形成的空间结构的多样性决定了蛋白质功能的多样性，B错误；高温能使蛋白质分子的空间结构发生改变而变性失活，其肽键一般没有断裂，C错误；组成蛋白质Computers and television have pushed a generation of children towards violent behaviour, and mental illness, a large-scale study said yesterday. Though the main reason for children’s violent behaviour comes from family, the study report also blamed computer games, the internet and television for breeding violence and increase mental illness.The study report warned of the effects of long hours spent watching television, on the internet and playing computer games. 'There is much evidence that exposure to violent images encourages aggressive behaviour,” it said. On television, violence is frequently shown as part of a normal human life. The violence is both physical and psychological, and violent argument appears as a standard response to disagreement. To be sure, there is plenty of violence in Shakespeare plays and in the cinema. But people used to go to the cinema once a week, whereas our children now watch television for an average of 17 hours a week.According to the report, the harm caused by computer and television has been widely recognized, which is only second to family factors including family break-up and the lack of a father living at home.  No doubt, selfish behaviour by adults is mainly responsible for the misery of millions of children.Many parents’ aggressive pursuit of personal success has pushed the needs of children aside and amounts children’s violent behavior. The belief among adults that the main duty of the individual is to make the most of their own life, rather than contribute to the good of others, is causing our young people a range of problems.At the end, the report calls for measures to cut the impact of television on young people, including a ban on all advertising aimed at children under 12, set up watchdog equipment on every TV set to control what children watch and put an end to advertising of alcohol and unhealthy food before the 9pm watershed. And more importantly, it calls on all British parents to value the once-in-a-lifetime period of their children’s growth.  Or, according to the report, they will soon regret their absence in that special period when their kids have grown into the “bad guys.”72. The study is mainly about ______. A. the family and social reasons for the children’s negative behaviour B. the importance of a complete family on the behaviour of children C. the ways to reduce the influence of television on children D. the relationship between parents and children73. According to the passage, which of the following statements is NOT TRUE? A. The major reason for children’s bad behaviour comes from family. B. Watching too many violent images will cause violent behaviour. C. Classical works are violence-free so people in the past were not that violent. D. Many parents put personal success ahead of their children’s benefits.74. According to the passage, what kind of TV program is more likely to be shown after 9 p.m.? A. Cartoons for kindergarten children. B. Gardening programs for housewives. C. Action movies with violent scenes. D. Political talk shows for adults.75.   The passage mentions all the measures to reduce the TV influence EXCEPT ______. A. advising parents to watch TV programs with children together B. stopping commercials for little children C. using a practical method to monitor what children watch on TV D. forbiding ads for harmful products shown before 9 p.m.