单选题红细胞中还原型谷胱甘肽不足，而导致溶血，原因是缺乏

单选题家族性高胆固醇血症的原发代谢障碍可能是

单选题最直接联系核苷酸合成与糖代谢的物质是

单选题参与胆固醇逆向转运的脂蛋白是

单选题底物浓度对酶促反应的影响错误的是

单选题测得一块蛋糕含氮量是1.6g，它该含多少克蛋白质

单选题线粒体内膜两侧形成质子梯度的能量来源是

单选题下列哪种维生素不是脂溶性维生素

单选题哪种碱基只存在于RNA而不存在于DNA（）。

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