真核生物有细胞核,原核生物没有,这对大分子的合成有重要意义。在原核细胞中没有核膜隔开转录和翻译,故当新生RNA链还连在正在转录着的RNA聚合酶上时,核糖体已结合在链上了。事实上,肠道细菌中最为人所了解的调控机制之一,即衰减作 Eukaryotes have nuclei, prokaryotes do not, which is of great significance for the synthesis of macromolecules. In prokaryotes, there is no nuclear membrane that separates transcription and translation, so when the nascent RNA strand is attached to the transcribed RNA polymerase, the ribosomes are already bound to the strand. In fact, one of the most well-understood regulatory mechanisms in gut bacteria is attenuation