题目

克隆羊“多莉”的诞生，震惊了世界，多莉羊的性状几乎与提供细胞核的母羊一样，由此可以推断细胞中的遗传物质主要存在于 （ )A.细胞膜 B.细胞质 C.细胞核 D.细胞壁 答案：【答案】C【解析】细胞核是遗传的控制中心，它里面含有遗传物质，能够传递遗传信息 。因此小羊多莉的身世说明遗传信息在细胞核内 。威尔穆特从一只苏格尔黑脸母羊的卵巢内取出成熟的卵细胞，并剔除其细胞核；从一只芬兰白脸母羊的乳腺细胞中取出细胞核，并移植到黑脸母羊的去核卵细胞中， 16. The politician has been warned that he would be getting into great trouble_____stick to his standpoint. A. were he to        B. he will C. he was to         D. would he