A:信使RNA和转移RNA
B:DNA和信使RNA
C:DNA和转移RNA
D:DNA和基因
在分层设色地形图上,绿色表示的地形是( )
——Do you know ____ boy who can play ______ violin? ——Yeah! He is ___ artist. He also plays ___ football very well.
下列关于植物体细胞杂交的叙述,错误的是