题目内容

DNA所处溶液离子强度越小,其Tm值

A. Tm值越低
B. Tm值越高
C. Tm值范围宽广
D. Tm值范围狭窄
E. 不影响

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加热是260nm光吸收增加的单链分子是

A. DNA
B. 蛋白质
C. 维生素
D. RNA
E. 脂类

使核酸分子具有较强紫外光吸收能力的是

A. 氢键
B. 3',5'-磷酸二酯键
C. 疏水作用力
D. 碱基中的共轭双键
E. 静电斥力

核酸分子吸收紫外光的键是

A. 疏水作用力
B. 磷酸二酯键
C. 静电斥力
D. 碱基共轭双键
E. 氢键

You will hear a conversation between a secretary and a general manager. The conversation will be played TWICE. Complete the manager's schedule by filling in the blanks. Write only ONE word or number in each blank.[音频]Schedule9:00 a.m. _1morning meeting;10:30 a.m. Meeting with administration staff, a_2_to make;2:00 p.m. Personnel problems to be discussed with Jerry;3:30 p.m. A__3 to the Lawrence Foods, discussion with CEO_4Tripp;7:30 p.m. A5to Beijing.