组成蛋白质的基本单位是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25864' and id < 2171332 and id<>'2171332' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25864' and id > 2171332 and id<>'2171332' order by id asc limit 5