单选题从量上说，餐后肝内葡萄糖去路最多的代谢途径是( )(1990年)

单选题Rarely do major diseases have a single cause. They are usually the result of a complex interaction between many factors, including genetic, environmental and lifestyle components. Many media reports, however, can tead us to believe that if we gave up something that we might otherwise enjoy, we could completely escape that particular affliction. Clearly, this is not the case. Vegetarians die of cancer of the colon (结肠). Teetotallers die of liver complaints, including cirrhosis (硬化). People who never go out in the sun contract skin melanomas (黑素瘤). Always, there are other factors at work than the single element being examined in a scientific study. Quite often the alleged benefits of a particular nutritional element are the result not so much of the element itself but of the lifestyle and general diet of the people who consume it most. People who eat lots of "healthy" foods, including fiber, carrots, broccoli etc. , also tend to drink less alcohol, take more exercise, avoid too many fatty foods and smoke less. Only when a study can rule out all of these other factors and often we do not know what these factors might be can we say that there is a causal link between two things. That is not to say that things like fiber and broccoli have no beneficial effects at all. But those with sedentary lifestyles cannot expect these foods to make them healthy. There is, however, one thing which increases the likelihood of dying relatively young, even when all of the other factors have been taken into account. It is one of the biggest killers even among those who lead lifestyles which, by any criteria, are clearly healthy ones. This single, incontrovertible risk factor is that of being poor. Recent report from the Cancer Research Campaign suggested that 12 700 deaths could have been avoided between 1986 and 1990 if inequalities in cancer care did not exist in England and Wales. Comparing cancer survival rates, the study found that England and Wales fared unfavorably with Europe and the US, but the most affluent regions of these two countries exhibited similar figures to the European average. In an attempt to counter this disparity the government has announced plans for the provision of Health Action Zones which seek to encourage greater cooperation between health and social services, targeting both rural and inner city areas. The emphasis of this new scheme however appears to focus on inadequacies within health education in these areas, rather than attacking the broader issues of social inequality.

单选题下列属于全局比对算法的是( ) A．Needleman-Wunsch B．Smith-Waterman C．PIR D．PAUP E．Pfam

单选题影响Hb与氧结合的因素是______。

单选题关于G蛋白的叙述中，错误的是

单选题不易进行的糖异生反应是

单选题人体内嘌呤核苷酸分解代谢的代表性终产物是

单选题磷酸戊糖途径的重要生理功能不包括

单选题脂肪酸β-氧化过程中脂酰CoA脱氢的受氢体为

单选题脂酰CoA经过一次β-氧化；其产物乙酰CoA通过三羧酸循环和呼吸链氧化磷酸化，共生成ATP分子

单选题下列哪项是磷酸戊糖途径中6-葡萄糖脱氢酶的辅酶

单选题A．AUUB．GUAC．AUGD．UGA

单选题用于质粒提取的溶液Ⅱ的主要成分为( ) A．SDS和EDTA B．SDS和氢氧化钠 C．EDTA和氢氧化钠 D．SDS和冰乙酸 E．氢氧化钠和冰乙酸

单选题不属于血浆功能性酶的是 A.磷脂酰胆碱胆固醇酰基转移酶 B.脂蛋白脂肪酶 C.肾素 D.胰脂肪酶 E.前激肽释放酶

单选题不参与组成NADH氧化呼吸链的组分是 A.FMN B.FAD C.泛醌 D.铁硫蛋白 E.细胞色素c

单选题在适宜的条件下，核酸分子两条链通过杂交作用可自行形成双螺旋，取决于

单选题用于测序的DNA末端终止法中不需要______ A.四种脱氧核苷酸(dNTP) B.四种双脱氧核苷酸(ddNTP) C.DNA聚合酶 D.32P标记的一种dNTP E.DNA连接酶

单选题珠蛋白生成障碍性贫血是一种( ) A．早幼红细胞贫血 B．营养性缺铁性贫血 C．遗传性溶血性贫血 D．遗传性障碍性贫血 E．常染色体显性遗传病

单选题占体重比例最多的体液是

单选题有关复制转座，不正确的叙述是( )。 A．复制转座子，即在老位点上留有一个拷贝 B．要求有转座酶 C．移动元件转到一个新的位点，在原位点上不留元件 D．要求有解离酶