在DNA编码序列中一个碱基G被另一个碱基C替代，这种突变为

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24654' and id < 2114123 and id<>'2114123' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24654' and id > 2114123 and id<>'2114123' order by id asc limit 5