来自《耶鲁大学开放课程：生物医学工程探索第4集第4集》

That way you could deliver a small number of vectors and

这样你只需向细胞中转入少量载体
they could amplify into a large number of vectors.

就能得到大量的拷贝
So having a place that the cell knows -

所以得有一个细胞能识别的区域
where the cell knows

能使细胞知道
how to replicate is important

怎样来复制这很重要
and so plasmids have an origin of replication.

因此质粒上带有一个复制起点
The blue region here is a gene.

蓝色的区域是一段基因
It's a gene that's on the plasmid,

它是质粒自带的基因
and this particular gene

如果细胞能够获得这种质粒
confers a specific biological property to cells

并正确的利用它的话
that have the plasmid and can use it properly.

这段基因就能赋予该细胞某种生物学特性
The property it gives here is called AMPR

这里给出的这种特性叫做AMPR