单选题下面关于酶的描述，那一项不正确

单选题增强子

单选题脂肪动员的关键酶是

单选题关于脂类的消化和吸收的叙述，不正确的是

单选题正常人血浆中NaHCO 3 /H 2 CO 3 之比是

单选题自然界游离核苷酸中，磷酸最常见是位于（）。

单选题蛋白质生物合成是指

单选题下列与DNA解链无关的酶或蛋白是

单选题有些基因在一个生物个体的几乎所有细胞中持续表达，这类基因称为

单选题 SAGE方法得到的标签序列长度大约是（ ）。 A、100～150bp B、9～14bp C、50bp D、500bp

单选题属于肝己糖激酶的同工酶类型是

单选题无机盐的生理功能不包括（ ）

单选题 翻译后加工不包括 A、由分子伴侣辅助折叠成空间构象 B、新生多肽链从tRNA上水解释放 C、亚基聚合 D、氨基酸残基的共价修饰 E、辅基的结合

单选题正常人血清清蛋白／球蛋白之比值为

单选题关于DNA复制，下列哪项叙述是错误的

单选题由胆固醇合成胆汁酸的限速酶是

单选题How many really suffer as a result of labor market problems? This is one of the most critical yet contentious social policy questions. In many ways, our social statistics exaggerate the degree of hardship. Unemployment does not have the same dire consequences today as it did in the 1930's when most of the unemployed were primary breadwinners, when income and earnings were usually much closer to the margin of subsistence, and when there were no countervailing social programs for those failing in the labor market. Increasing affluence, the rise of families with more than one wage earner, the growing predominance of secondary earners among the unemployed, and improved social welfare protection have unquestionably mitigated the consequences of joblessness. Earnings and income data also overstate the dimensions of hardship. Among the millions with hourly earnings at or below the minimum wage level, the over-whelming majority are from multiple earners, relatively affluent families. Most of those counted by the poverty statistics are elderly or handicapped or have family responsibilities which keep them out of the labor force, so the poverty statistics are by no means an accurate indicator of labor market pathologies. Yet there are also many ways our social statistics underestimate the degree of labor-market-related hardship. The unemployment counts exclude the millions of fully employed workers whose wages are so low that their families remain in poverty. Low wages and repeated or prolonged unemployment frequently interact to undermine the capacity for self-support. Since the number experiencing joblessness at some time during the year is several times the number unemployed in any month, those who suffer as a result of forced idleness can equal or exceed average annual unemployment, even though only a minority of the jobless in any month really suffer. For every person counted in the monthly unemployment tallies, there is another working part-time because of the inability to find fulltime work, or else outside the labor force but wanting a job. Finally, income transfers in our country have always focused on the elderly, disabled, and dependent, neglecting the needs of the working poor, so that the dramatic expansion of cash and in kind transfers does not necessarily mean that those failing in the labor market are adequately protected. As a result of such contradictory evidence, it is uncertain whether those suffering seriously as a result of thousands or the tens of millions, and, hence, whether high levels of joblessness can be tolerated or must be countered by job creation and economic stimulus. There is only one area of agreement in this debate—that the existing poverty, employment, and earnings statistics are inadequate for one of their primary applications, measuring the consequences of labor market problems.

单选题细胞间信息物质不包括

单选题下列哪一种不是人体必需氨基酸

单选题不属于血浆非蛋白类含氮化合物的是