For example, metabolite recognition in the cells must occur within the mere seconds that it takes polymerase to stream out an mRNA leader and ribosomes to bind to it and begin translation.

• 举例来说，细胞内代谢物的辨识必须在短短几秒内完成，这是聚合酶开始生产mRNA先导序列而核糖体与之结合并开始转译所需的时间。