第10题: [单项选择]下列有关动物细胞克隆的叙述,错误的是() A. 细胞克隆可用于从普通细胞系中分离出缺乏特殊基因的突变细胞系 B. 原代培养物在首次传代时就成为细胞系,都有异倍体核型,遗传物质有所改变 C. 应用克隆培养法建立的单克隆细胞团可称为细胞株 D. 提高动物细胞克隆形成率需要添加血清(胎牛血清最好)及激素刺激等条件 参考答案:B
第22题: [填空题]What were Thomas Jefferson and John Adams in the American Revolution They were (). 参考答案:important leaders 答案解析:
[听力原文]
Thomas Jefferson and John Adams were two of the important leaders of the American