单选题体内氨的主要来源是（ ）

单选题对于酶的化学修饰调节不恰当的是

单选题可促进机体钙、磷吸收的脂溶性维生素是（ ）

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) .

单选题氯霉素抑制原核生物蛋白质生物合成的机制是

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

单选题酶原所以没有活性是因为

单选题类固醇激素受体复合物发挥作用需要通过

单选题肽键平面元素组成的特点可以是

单选题正常血浆中含量最多的阳离子和阴离子是

单选题下（）不是呼吸链的组成成份。

单选题合成甘油磷脂的酶系存在于

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（）不能异生成葡萄糖。

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 用来对蛋白质三维结构进行建模的是（ ） A、SWISS-MODEL B、TargetP C、SignalP D、Compute pI/Mw

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

单选题聚合酶链反应(PCR)的每个循环需依次进行