_________along the quiet road at forty miles an hour, and then an old man suddenly started to cross the road in front of me. A. Driving B. when I was driving C. I was driving D. Having driven 答案:C 解析: 略
下列关于DNA或基因的叙述中,错误的是
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A.肺炎双球菌的转化实验证明:能使R型菌发生转化的物质是S型菌的DNA
B.DNA分子具有多样性的主要原因是由于碱基配对方式的不同
C.可利用DNA做亲子鉴定是因为DNA分子具有特异性
D.遗传信息是指有遗传效应的脱氧核苷酸序列