Application of the cis-trans test defines the genetic unit of function, the cistron.

顺?反测验可以定遗传的功能单位―顺反子。

Like eukaryotes, but unlike bacteria, they have introns in their transfer RNA, but like bacteria they have polycistronic operons (gene regulators).

像真核生物而不像细菌，转运RNA中有内子，还有细菌不具备的多顺反子的操纵子（基因的调控子）。

All of the genes necessary for the lytic cycle are expressed in polycistronic transcripts from three promoters.

编码噬菌成分的基因则排列为簇。裂解周期所需要的基因则以三个启动子起以多顺反子转录的形式表达。