【判断题】聚合酶链式反应,是从新DNA链的3‘扩增到DNA的5’端。
【单选题】Llamo a Perdo esta noche. 此 句中直接宾语是:
【简答题】DNA 聚合酶链式反应,简称 { } ,是一种常用的 DNA 体外扩增技术。
【判断题】聚合酶链式反应(PCR) 是体外基因扩增法。
【简答题】基因扩增或基因放大是指______,它是通过局部DNA的来实现,______扩增可导致细胞癌变。
【简答题】As early as 17 Ohio made a decision that free, tax-supported schools must be established in every town ________ 50 households or more. A) having B) to have C) to have had D) having had
【单选题】Managers must establish and implement inventory policies on the basic of ( ) consideration.