题目内容

DNA提取中异丙醇的主要作用是( )

A. 异丙醇可以沉淀DNA
B. 异丙醇可以溶解DNA
C. 异丙醇可以溶解上清液中的杂质
D. 异丙醇可以沉淀上清液中的杂质

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在CTAB法提取基因组DNA的过程中,用到的试剂有( )

A. CTAB提取液
B. 无水乙醇
C. 75%乙醇
D. 氯仿/异戊醇
E. 双蒸水

“CTAB法”和“SDS法”是提取DNA的常用方法. ( )

A. 对
B. 错

DNA的提取过程中,必须剧烈震动混匀,这样才能使反应试剂充分接触,反应充分进行。( )

A. 对
B. 错

A. Complete each sentence with the given verb in its indefinite tense.1. Tom ____ (play) football with his friends after school.2. The classroom (have) eight big windows.3. _you _ (visit) your relatives last Spring Festival?4. — he (fly) a kite on Sunday?— Yes, he .5. I ________(give) it to you as soon as he comes back.