You're not fishing through a whole chromosome in order to find what you want, but you're going to a cell that's already enriched in it.

你不是大海捞针地,在一整个染色体中找基因,而是在一个充满了,你感兴趣的基因的细胞里找

耶鲁公开课 - 生物医学工程探索课程节选

Certain segments of DNA are being converted into RNA, and whereas in replication, you have to copy the whole genome, the whole - all of the chromosomes, all of the DNA contained in the chromosomes of the cell in order to completely replicate it; transcription only works on particular sequences of DNA.

特定的DNA序列被转录为RNA,在复制的过程中,整条染色体都被复制,包括其中的全部DNA序列,都被分毫不差地复制下来,以保证复制的完整性,而转录过程只发生在特定的DNA序列上

耶鲁公开课 - 生物医学工程探索课程节选