具有100个碱基对的一个DNA分子区段，内含40个胸腺嘧啶，如要连续复制两次，则需游离的胞嘧啶脱氧核苷酸

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22593' and id < 1980208 and id<>'1980208' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22593' and id > 1980208 and id<>'1980208' order by id asc limit 5