单选题最直接联系核苷酸合成与糖代谢的物质是

单选题A.柠檬酸循环B.甲硫氨酸循环C.嘌呤核苷酸循环D.乳酸循环

单选题核酸中核苷酸之间的连接方式是

单选题丙二酸对琥珀酸脱氢酶的抑制作用属于

单选题纯化酶制剂时，酶纯度的主要指标是

单选题对于酶的化学修饰调节不恰当的是

单选题用离子交换树脂纯化蛋白质是根据不同蛋白质的什么性质

单选题A variety of illegal acts committed by people in the course of their employment, for their own personal gain, are collectively known as white-collar crime. Embezzlement, theft and trading securities (1) insider information are common forms of white-collar crime. The majority of cases involve low-level employees who steal because they are under (2) financial stress. Many plan to (3) the money back as soon as possible but may never do so. Their crimes are usually never (4) because the amounts of money are small, and no one notices the (5) . (6) , there are some very large cases of white-collar crime, such as multimillion-dollar stock market or banking seams that take years to discover and are extremely difficult and expensive to (7) . White-collar crime is not (8) to the business sector. Government employment, especially (9) the city level, also provides opportunities to (10) one's pockets. (11) , building inspectors accept bribes and full-time employees receive (12) payments. Although white-collar crime is less (13) than street crime, it involves (14) more money and harm to the public than crimes committed by street criminals. It is (15) that there are more criminals (16) the office suites than in the streets, yet the (17) of white-collar makes it difficult to uncover the offenses and pursue the offenders. As the economy (18) from manufacturing to services and electronic commerce, opportunities for white-collar crime (19) , while the technology needed to stop such crimes will (20) .

单选题胆汁中含量最多的有机成分是

单选题下述氨基酸中哪一种是非必需氨基酸

单选题A．α-酮戊二酸B．5-磷酸核糖C．二磷酸尿苷葡萄糖D．琥珀酰CoA

单选题有关变构酶的叙述哪项是不正确的( )(1988年)

单选题下列氨基酸中属于碱性氨基酸的是

单选题类固醇激素受体复合物发挥作用需要通过

单选题A.双链DNA解链成单链DNAB.单链DNA恢复成双链DNAC.50%DNA变性时的温度D.OD280增高

单选题经脱羧基后可作为多胺生成原料的氨基酸是

单选题能直接识别、结合TATA盒的基本转录因子是

单选题糖酵解途径中，催化第二次底物水平磷酸化反应的酶是

单选题不能进入三羧酸循环被氧化的物质是

单选题下述哪种化合物中不含高能磷酸键