原核生物mRNA与真核生物mRNA结构L比较 Prokaryotic mRNA 5 3 ⊙⊙ AUG AUG AUG protein Q protein B protein Y Eukaryotic mRNA 5 3 AAAAA AUG 5'cap one protein key: ribosome-binding coding noncoding stop codons sites sequences sequences原核生物mRNA与真核生物mRNA结构比较 核糖体可以不从mRNA上解离连续合成三个蛋白质 Eukaryotic mRNA Prokaryotic mRNA