如果是初中的话你这么简单的写就好了
In gene expression, there is two step to make protein, the first step is DNA to mRNA through transcription, and the mRNA to the polypeptide chain through translation. In transcription, mRNA is made by the template of DNA strand, which is forming by the base pair A-U C-G G-C T-A. the second step translation, with the anticodon, mRNA is decoded in ribosome which is located outside the nucleus to make the polypeptide chain.