单选题嘧啶核苷酸从头合成途径首先合成的核苷酸是

单选题关于结合胆红素的叙述，错误的是

单选题决定基因表达空间特异性的因素是

单选题 在疾病时基因组差异表达分析目前最多采用的方法是 A、DNA芯片技术 B、寡核苷酸杂交分析 C、变性梯度胶电泳 D、等位基因特异寡核苷酸杂交 E、蛋白质芯片技术

单选题 RNA合成的部位是 A、细胞质 B、线粒体 C、细胞核 D、核糖体 E、微粒体

单选题在基因工程中常用的限制性内切酶的类型是

单选题琥珀酸呼吸链的排列顺序是

单选题生长因子

单选题ρ因子的功能是

单选题DNA的遗传信息通过哪种物质传递到蛋白质合成

单选题下列属于顺式作用元件的是( )。

单选题有关HMGCoA还原酶的叙述中不正确的是

单选题 比较几个新确定的RNA序列宜使用（ ）。 A、Clustal B、Murlet C、MUSCLE D、ProbCons

单选题下述哪种酶在糖酵解和糖异生两条途径中都起作用

单选题下列哪个酶不是糖异生的关键酶

单选题关于酶的化学修饰，错误的是

单选题农药敌敌畏可抑制

单选题能为20种氨基酸编码的密码子有

单选题编码组成蛋白质的20种氨基酸的密码子数量

单选题Fear seems to be the dominant mood of the moment. Hurricanes, tidal waves, floods, earthquakes and terrorism this year have all brought with them not only appalling scenes of devastation, death and suffering, but also outrage at the lack of preparations to avoid or cope with these disasters. Now even the birds of the air are a threat, we are told. That migrating flock visible On the horizon at sunset, once a consoling reminder of the eternal rhythms of nature, could be carrying the virus which might soon kill tens of millions of people. Given the many fingers pointed at governments in the wake of other disasters this year, it is hardly surprising that they are scrambling to respond to the threat posed by avian influenza. After confirmation this week that the HSN1 strain of bird flu, which has been spreading quickly in Asia, had been discovered in Romania and perhaps Greece, European Union foreign ministers convened an emergency meeting. President George Bush, still smarting from a torrent of criticism of his government's clumsy response to Hurricane Katrina, has promised to rush out emergency plans for dealing with an outbreak of pandemic flu which have been stalled for years. Countries around the world are hurrying to stockpile the only current antiviral drug, Tamifln, which might be effective in saving lives in any pandemic or curbing its spread. The World Health Organisation is calling for an internationally coordinated effort. Health ministers from around the globe are due to meet next week in Canada to discuss what steps to take. Is any of this eff6rt justified? Or are politicians simply helping to feed public panic, and then covering themselves by promising to spend lavishly against a threat which may never materialize and to reduce a risk which they do not understand? To ask these questions is not to counsel complacency, but to apply the kind of test which is required in any kind of disaster planning, not least because the world is an inherently dangerous place and it is impossible to plan against every possible disaster. With the media full of warnings of impending mass death, an overreaction is all too possible.