题目

He wrote a lot of novels，none of ________ was translated into a foreign language. A．them           B．whom       C．that         D．which 答案：D限制性内切酶的特点是：A．只能识别GAATTC序列B．识别特定的核苷酸序列和具有特定的酶切位点C．识别黏性末端D．切割质粒DNA的标记基因