IfI_____you,I_____lateforschoolthismorning. A: were,wouldn’tbe B: were,wouldn’t C: was,won’tbe D: am,will

DNA片段在TBE电泳缓冲液中带负电荷，在电场中

"That must be a mistake." "No, it____ a mistake." A: must not be B: needn't be C: can'tbe D: wouldnotbe

上海师大附中等六校2011届高三联考英语试题“Aren’ttheymeetingushere?”“Wellthey___________becausetheyweren’tathomewhenIrangafewminutesago．”A．mustbeB．can’tbeC．mustD．needn’tbe

Little children _________ getaway with telling lies. A: should allow to B: shouldn’t allow to C: should be allowed to D: shouldn’tbe allowed to

蛋白聚丙烯酰胺凝胶电泳所使用的电泳缓冲液为（） A: TAE B: TBE C: TPE D: Tris-甘氨酸缓冲液 E: 碱性缓冲液

提取出的DNA样品最好保存在（）中 A: 超纯水 B: TE缓冲液 C: 75%乙醇 D: TBE缓冲液

Which of following is the best choice for storage of extracted DNA sample: A: ultrapure water B: TE buffer C: 75% ethanol D: TBE buffer

蛋白聚丙烯酰胺凝胶电泳所使用的电泳缓冲液为（） A: TAE B: TBE C: TPE D: Tris-甘氨酸缓冲洗液 E: 碱性缓冲液

提取出的DNA样品最好保存在什么中（ ） A: TE缓冲液 B: 超纯水 C: TBE缓冲液 D: 75%乙醇